When X-3 would run the Plug-In Scan, it would get to the Oberheim SEM V and crash the scan.  Worked with Tech Support on it for a bit and could not resolve it.  Did some work on my own and did the following:
 
1) Went to Arturia website and downloaded the latest upgrades to my modules.
2) Made sure all the Arturia .dll files were in the scan
3) Found the default path for the Arturia Modules was C:\programfiles (x86)\arturia.  Added it to the vst scan 
 
All  modules load up and work perfectly now
 
FIXED !

Somebody posted earlier to have problems with Arturia- I was waiting to hear more before I buy it. Thanks for posting. How do you like the synth plug ins?
 
Your solution makes no sense, as if Arturia folder was not listed for scan, it would not be crashing. It would not be scanned at all- it would not show up. I would believe- update helped. If you don't mind me to ask- what the tech support suggested you to do? If you say- you had to figure it out on your own to include the folder to scan, and tech support did not suggest it- that warns me about the quality of tech support they provide.

There were two problems:
 
1) The VST Scan was crashing when it got to the Oberheim SEM V.  I believe the fix was updating the SEM V to the latest version.  The updates are free. The .dll files were in the vst folder in the cakewalk directory and that is what it was scanning.
 
2) The second problem had to do with the Arturia Modules not showing up in my plug in manager.  This was fixed by adding the "C:\programfiles (x86)\arturia." to the vst folder scan.
 
As far as how good are the Arturia plug ins.  I haven't used all of them.  In fact I have only used 3 or 4 modules.  I used to own a Prophet5 Rev2, Oberheim Xpander, and a Memorymoog back in the 80's and sold them in the early 90's.  They sound very close to the original.  If you want that analog sound and you are not getting it from you digital software like Massive, Z3ta, etc., Arturia will give you that sound you need.  I also have the Sonicprojects OP-X Pro-II (Oberheim OBX clone) software and the Memorymoon ME (Yamaha CS80 clone) and both of them work very well also and are great sounding.  A lot has to do with how well you can program an analog subtractive synth.  Most presets are a good starting point and will sound better once you teak the sounds and add effects.

Thank you for your reply. I am looking for good dubstep sound with fat synths, but musical. I bought Novation V-Station and Bass station and I was not impressed. Aside of issues with Sonar, they just very basic-sounding. "Synth pan left, Synth pan right". I have original Novation Supernova, and V-Station kind of reminds me that, but this is not what modern Dubstep is made with. I have a feeling that Arturia will be the same way- more imitating hardware synths than creating new songs nobody heard before.