I highly recommend all the Groove 3 videos starting with version 1.5 even and going into 2 and then 3. There are Explained videos and Advanced videos for all versions. Stuff that is explained in V1.5 say does not get explained again. Only new stuff is added.
 
One good option is to get one of those passes say for a month or two and do some intense learning. They are all beautifully explained. Good idea also is to run the video on a separate machine (with audio mixed in with your normal DAW audio) and have Studio One running in front of you on your main machine.
 
There are also tons of free Presonus videos too.  The Groove 3 stuff is logically explained in a great learning order though. Then you get cracking doing projects and use the information you have learned.

I've posted this before, but here it is again: Audio Myths & DAW Wars
 
Although I likely won't be upgrading to Studio One Pro myself, I would encourage anyone interested in Studio One to pay attention to Jeff Evans. He's one of the most knowledgeable users on this forum, and a nice guy, too.
 
Thanks for all your great posts, Jeff!

I have had about 3 crashes with Studio One in 6 or 7 years so that to me inspires plenty of confidence. Sounds like it might be something else causing the issues if you are having S1 crash. It is not prone to crashing at all.

Guys, good grief.  It's silly to bash Studio One (or any other DAW) if you've only spent a few hours, or a few days on it compared to years you've been on Sonar.  Some of the things I'm seeing people get stuck on are really basic, but you do need to learn how the other DAW does it; it's not going to be just like Sonar, and you shouldn't expect it to be.
 
Six months ago I thought Sonar was the only game in town.  Then, some Studio One users explained some of their workflow.  It really opened my eyes and got me investigating more.  I can tell you that after about six months Studio One, and mixing probably about 50 songs on it, my current workflow mops the floor with my Sonar workflow, for production and mixing, and that's after being with Sonar for a really long time.  Do what feels right, of course, but give it some time, you may very likely like it better after you see how things work.
 
A few bread and butter items:
 
I don't need a gain knob.  The easiest way to adjust the gain of an audio track is to click the track event and drag up the blue handle in the middle; as a bonus, the waveform changes accordingly...I may be wrong but never noticed that in Sonar.  You can toss in the Mix Tool plugin on all tracks at one if you like, and there you'll get polarity, gain knob, other good stuff.  I'll admit, they should put a polarity switch right on the strip.
 
Select multiple tracks:  CTRL+ click the ones you want, then set faders as a group.
 
Select all tracks:  Click the first, Shift, click the last.  (agreed, CTRL+A is better) 
 
Once you select the tracks, drag in any plugins you like, very easy and all at once.
 
Function Keys:  just try them out and toggle them...very cool.
 
To add a VI:  click and drag it to a track
 
Multiple outputs on VI's.  On the console, click the arrow by the VI, click expand and check the outputs you want.  Set outputs accordingly on the VI.  Eezy peezy.
 
Freeze a VI:  right click and "transform to audio"
 
Manual plugin scan:  open the browser on the right, click the home button, click "update plugins".
 
File management?  Songs and project file management is super tidy in Studio One.  Very easy to find anything.  It handles much of this for you in a great, logical way.
 
Track management?  That was a nightmare for me in Sonar.  Click, scroll, click, scroll.  On Studio One I can organize tracks for a big 70-80 plus track project in like 3 minutes on Studio One, then focus really easily on the groups I need when it's time to start mixing.  I'm lighting fast on Studio One...I'm not bragging, that's just a fact.
 
It has a proper track list, and when you click on a track on the tracklist, you land on that mixer strip.  Sonar did not do this and this was a complete PITA.  The tracklist also shows you at a glance what's playing.
  
Export:  Set begin and end markers, CRTL+E, pick your format, done.
 
Plugin chain windows:  you can get to all the plugins on one window.  I didn't notice this in Sonar, and it's insanely convenient.
 
Float the mixer to another monitor?  Of course.  But I don't need to.  F3 to show the mixer, drag it all the way up for a huge, gorgeous console with the longest faders, then F3 to toggle between the editor and mixer.  My eyes are not working so hard by constantly going back and forth between two monitors.  It's one less monitor to buy.  But yes, it will do that.
 
Sidechaining:  add a send, click side chain, pick the destination.
 
Tempo change:  show the Tempo Track. set the resolution (probably already done), alt+click and drag to draw your tempo changes in.  Or, + on the tempo track to add a new tempo.
 
Time signature change:  right click on the top timeline to insert a new time signature.
 
It's like everything is a 1-2 click operation.  It's taken me mixing about 30 songs before getting to what I felt was pretty good proficiency, and I still have much to learn.  But after that, Studio One is just working much better for me now.