I really like my M-Audio Code 49 Keyboard.
 
I like the Semi-weighted keybed with aftertouch and four assignable zones
I like the 16 fully assignable backlit drum pads
I use the XY pad
I received a good collection of AIR Music Technology bundled software.
 
Although it has fully assignable controls with Mackie Control and HUI modes, I don't use it to control Sonar, I use a Macike Control Universal for managing Sonar Platinum.  
 
However, I do like using the Faders and knobs to assign to Soft synths in order to control them.

Wanna know how much I like my controller keyboard? Its a Roland A-80. They stopped making it over 20 years ago and I'm still using one. Almost everything on the market today feels like a toy in comparison.

I have a Kurzweil PC3X that I no longer use for live performances (I'm too old, and it's too heavy).  Functions fine as a controller, and more importantly (to me), it has an excellent piano action and an a$$-load of onboard sounds.  Depending on the project, I sometimes get away with just playing all the tracks with Kurz sounds and recording audio (rather than MIDI) in Sonar

jpetersen
Nearly all have 8 of everything - switches, knobs - and esp. sliders.
 
The famous Hammonds had 9 drawbars, darnit. Hasn't anyone noticed?
 

yep, its a shame and unless you go for a piano style board which is not ideal for playing organ you are stuck at 61 keys, you need 73 if you want access to the lower octave switch keys and the full range of the instrument.

Interesting,
I still use my M-Audio Pro 88. It is older but has enough knobs, rotaries and sliders to cover 85-90% percent of what I need for it to control wise. I have been looking at the newer stuff for years, but have not had anything to make me jump ship. Also, my Axiom 61 r2 has been a great standby/stand in when required. 
 
I guess it boils down to what the expectations are. If I am trying to get an idea down, With the mapped controls I can do the transport , control faders, switch banks, use the rotaries for panning and not move from the Pro 88. This has always been "cool" for me. 
 

I use a Roland D-20...

I'm very happy with my NI Komplete Kontrol S49 (61 keys would be nice, but didn't want to spend the extra $$, plus space is an issue), but really its value is tied to its use with NI products. As mentioned above it works seamlessly with NI Komplete and Maschine, as well as other plugins that support the NKS format. This includes the Arturia V Collection, which I just scored for 60% off regular price (sweet!).
 
It's also a highly configurable standard MIDI controller, so it works well as a control surface in Sonar, but if you don't use NI and/or other supported plugins a lot (I do), there are any number of controllers that offer as much or more, probably for less money too. If you do use NI stuff a lot, I highly recommend it. I had to do a bit of fiddling to get the transport controls working in Sonar (as usual, this forum was a great help), and of course ACT is kind of a pain with just about any controller as far as I can tell. For that I HIGHLY recommend using the various utilities that Azslow has created and generously made available to make your ACT act right.
 
EDIT: I should add that you can manually create NKS presets and parameter mappings for any VSTi plugin, But Native Instruments and other vendors that support NKS work right out of the box.

A Roland PCR-200... hard to believe that plastic mess is still functioning...

M audio axiom 49 ... Rarely used these days.

My M-Audio Axiom died, but I now have a Nectar Impact LX 88+ which works well. It has integration with Sonar (and other DAWs) and integration with many software instruments. However, I use few of the integration features now as I recently got a Frontier Alphatrack and that works great for controlling Sonar. The LX is mostly now used for midi keyboard and CC for midi instruments - and transport when recording keys. I'm pretty happy with it.