RME HDSP9652 (PCI) + RME ADI-8 QS interfaced via ADAT lightpipe.

RME HDSP 9652 with Yamaha 02r and Sonar Platinum. Old but great Card! I have the same in my PC at Home but with V-Studio 100! Good enough fro mixing at home with good headphones:)
 
Bassman.
 

RME UCX here.
Rock solid since day one, zero latency issues.
 

Hi Rodreb,
i got pci cards from Creamware with scope 4.5 and it works awsome.
Take a look at sonic cores Xite. It can be interesting for you.
 
Cheers Tomas

M-audio Delta 44.  I can't remember when I got this thing, but it is OLD and still works great.  There are no Win10 drivers for it, and probably never will be, and why I'll be staying with Win7, likely until something forces me to do otherwise. 
 
PS: Haters gotta hate.

I can chime in with the Tascam 16x08 props.  Nothing but happy with it.  Performs as advertised, and that in itself is saying a lot.
 

Liquid Saffire 56 here. You may find this helpful  http://d3se566zfvnmhf.clo...affiredualuniteng0.pdf

I'm using a Yamaha/Steinberg MR816X with Focusrite OctoPre ADAT'd in. They pair quite well with a 2010 Portugese Red (Confidencial) when using Sonar Platinum. Search "Audio Interface" at Gearslutz. You'll see it pop up over and over. My Sweetwater Rep recommended the MR816X. I'm very happy with it. While I like the pres in the OctoPre, I like the pres in the Steinberg more. (More perceived weight/mass) The MR816's headphone amps were a pleasant surprise.

There is an issue with W10 driver. I'm sticking with W7 waiting for the update. Since it is such a popular model; they're sure to release a W10 driver soon.

I am kind of surprised there are not a lot of Presonus users. Makes me wonder if there may be issues with Presonus and Sonar or, if they are just not that popular?
 
Rod
I actually also have an old Presonus Firepod and I mean quite old (perhaps 10 years now) Still working fine on one of my older systems - went Focusrite when I put a new system in my studio in Cape Town a number of years back, and there was no Presonus dealer in South Africa at that time. I liked the Focusrite so much I then decided to stay with them when I upgraded here.
No issue from Presonus for me, just very happy with Focusrite
Nigel
 

Well, it doesn't look like EVERYONE has answered yet but I'll add mine.
 
RME Fireface UFX.