Cakewalk has given the VS-700 a very low priority, but they somehow keep it alive (don't know about Roland, though) i.e. when the X1 series came out, it took until X1d to see issues of VS-700 addressed, and when X2 came out, they had again forgotten about the VS-700, leaving users in total silence if there'd be any further support at all. Hence, you read a lot of negative posts in the VS-700 forum.
X2a addressed a lot of issues we had reported for the VS-700 (however not all); it's again pretty functional but apparently not as tightly integrated into the workflow as it was the case with Sonar 8.x. I'm personally quite happy with what I can do with it as it's still powerful and intuitive, but since I came in late (bought VS-700 a year ago), I paid a lot less than early adopters and also never used it with Sonar 8.x (hence, I can't compare to what it used to be like).
When I decided to go for it a year ago, I did a lot of research on options available at that time - and there weren't too many in that price range (meanwhile this might have changed). X1d was just out, listing numerous fixes, so I took the risk and jumped onto a unit that was sold off for about half price. I feel that I got a lot for what I paid:
- mic pres are good
- integration with Octa-Capture is super nice (after drive update in Nov 2012), combination of both with 3rd ADAT interface works very stable at low latency
- integration with X2a is much better than you get with MCU or other alternative; no customization or tedious set-up needed, but I wish I could assign a few more user buttons (or combinations of buttons)
- fantom synth I don't get to use a lot (sounds great, but is a bit of a 32 bit troublemaker), ARX is similar situation
There are several units that go for cheap these days. If you look around, you may still get a good deal out of it. Of course, you have to take the risk that Cakewalk might discontinue it as a control surface for Sonar ... but the way it looks like they seem to discontinue any controller for the sake of touch control (e.g. they haven't addressed MCU issues in a long time). Whether or not this is a good strategy the future will tell ...