Here is where I am at - I have a VS 700 Console & I/O need to upgrade from Windows 7 to Windows 10.  Got a new computer with Windows 10 and the VS 700 Console & I/O does not work with Windows 10.   So again, who is using what controller with SPLAT???
 
(Without any problems)!!!!

Hmm . . . are we talking high end controllers, or just something that works in Sonar ?
I'm using a Novation Impulse 61 (not exactly high end, but works), and utilizing AZ Controller, software which can be downloaded (and customized) right here from the Sonar Software forum (Sonar utilities, by Sonar users)
It's no mess, no fuss (Thank you Azslow !)
 
Truthfully, I wish I had purchased Native Instruments Keyboard Controller, since I use Native sampled Instruments a lot in my projects, it's very visual, and intuitive. (I've used it at another studio)
 
Can you give us more info on the types of projects you do ?

I thought the VS 700 did work in Win 10?  It just doesn't have a signed driver. Have a look here:
 
http://forum.cakewalk.com/How-to-use-V700-win-8-driver-in-win-10-also-applies-to-some-other-Roland-drivers-m3206046.aspx
 

Tascam US-2400. It's been very faithful for years. Can't complain.

I'm using a Korg NanoKontrol2, Presonus Faderport and Nektar Impact IX49. No problems with any of them.

Novation Impulse 61. Though I don't really use it for anything aside from the keyboard and the transport controls. 

tenfoot
I thought the VS 700 did work in Win 10?  It just doesn't have a signed driver. Have a look here:
 
http://forum.cakewalk.com/How-to-use-V700-win-8-driver-in-win-10-also-applies-to-some-other-Roland-drivers-m3206046.aspx

 
I got it working just fine with Windows 10 by following the advice in the forums.
 

The Avid Artist Series also works with SONAR. I wrote about how to do it in the Cakewalk blog.
 

With just one exception (Nektar Panorama in advanced mode), any existing device (real or virtual) which can be used as a controller at all can be used with Sonar. The difference is in:
* hardware controls: the type (motor-non motor, sensitive-non sensitive faders; endless encoders - finite knobs; buttons/pads with/without 'released' signal; etc) and quality
* existing Sonar integration: ready to be used out of the box (MCU, VS, Artist, Faderport, Impact, Console 1, several obsolete controllers) or not yet integrated (almost all other). Simple devices (with finite knobs and non motor faders) can be integrated by any user within reasonable time using Generic plug-ins. "Smart" devices are harder to integrate since they require some kind of "programming".
 
Note that what concrete device can do in Sonar is not device dependent. There is no exclusive "hardware to Sonar" bindings, the functionality is always implemented inside the software (Control Surface Plug-in).
 
I am home lonely player, so I just need remote transport, basic mixing, track navigation, softsynth/FX preset switching and sometimes specific parameters control when I physically sit away from the computer. And I do this from DP (pedals), MIDI controllers (VS20, MPK, Keystation) or Android Phone, with customized configuration for particular use case.
 

I'm using a Behringer X-Touch and an old Frontier Tranzport.  Both working perfectly in Win 10.