I've only messed with the tube sat briefly but I liked what it did on a bass track. Makes it all warm and gooey.

+1 to spectrum analyser. I've moved to Sonar just for pro channel. Sounds unique. I also have Waves SSL bundle. It sounds great too but -i don't know how to explain- ProChannel sounds more "logarithmical" to me :)

I use the pro channel a lot. Don't need all the VST windows 
 

At present Jazzsinger one can use multi EQs with the PC and the FX bin. Nothing is stopping anyone from using it and another VST at the same time. And using buses with it can provide multi EQs under the PC.

As for the screen space used that is not much of an issue when one considers that a VST often uses a lot more screen space when open.  Than with PC being in the Inspector pressing I can free up screen space very quickly. 

None of the convenience of the PC would be of any use if it did not perform extremely well.  That is the important point.   

Pro Channel user all the way. FX bins are used for reverbs and delays.

I can't say I use the PC that much except for the EQ. It is a very nice EQ.

Agreed about the graphics being to small. I wish they would put a button in the modules so you can enlarge the view so everything is easier to see. Not being able to see it well is a PC showstopper for me.

I just installed the upgrade from 8.0 to X1d. I bought X1 back when it was first available but didn't really have the need or time to break something that was working fine. Anyway, I don't regret the cut over/upgrade one bit. The Pro Channel is everything it was advertised to be, I use the EQ as part of a standard template simple carry along High pass filter. I was using a waves plug for all my EQing. I guess the short answer is errr Yup!

I use it! The PC absolutely rules for quickly dialling in bread-and-butter EQ and compression while in the creative writing/tracking phase. This way my flow isn't interrupted by spending time thinking about plugins.

i use the PC alot, i really like PC2A, wicked sound

I like the PC modularity. But I sure do like my Sonitus suite. It wouldn't hurt my feelings at all if they reworked the Sonitus Plugins and made them Pro Channel.

Pro Channel Rock!

PC for sure.
I have regular clients and have their 'vocal sound' saved as a PC preset. It makes set up so much easier - I just tweek the settings to suit the new song/recording.

I never use the Prochannel - I found that with the problems it had (version C) where it would turn itself on and off randomly, that I couldn't rely on it, as a result I have become used to using other tools.  Then again I have none of the expansions so maybe installing them helps?  I did like it the few times I used it.

Have the problems with it turning itself on and off (by itself) been resolved?  I would love to use it!  I won't be buying any expansions though as I don't want plugins that I can only use in Sonar.

I would concur with some of the comments that the PC EQ interface is not the best in the world, but given all the function in the small space, it is reasonable. The HPF and LFP are awesome and I use the HPF to roll off bottom on a large number of tracks in any project.  (You have to get things out of the way of the kick and bass, and you also don't want kick and bass fighting too much for the same band.)  Example: There is a night and day difference in the SI-Electric Piano (Rhodes) that comes with Producer before and after cutting a bunch of bottom out with the HPF.  It sounds good without EQ solo, but in a track it gets muddy really fast.
  
 
It is better if you have a console that supports the EQ so you can use actual knows instead of trying to tweak those freq bands with a mouse!  Tip: If you don't already know this, hold down the Shift key when moving knobs to make fine adjustments.  I will bet 99% of you know this, but someone's life will change by learning that!
 
By the way, the 1176 emulation is pretty good for a free, bundled, software-only plug-in.  To me, it is not as quiet as a real 1176LN, but in fairness, I no longer have a hardware unit for side-by-side comparison.  The real ones I used always belonged to one of the larger facilities where I was cutting.

I use the gate in PC whenever I need one.

I just Softube's TSAR-1R and so when I use that, I'll probably use it on a bus in PC.

Overall, I'm still an old skool FX bin guy.

FWIW, I do have all the Cake PC modules. Missed out on the Softube bundle.