I'm running the v3 build on an i7 3930k (6-core 12-thread - Sandy Bridge-E - Windows 7) and have found 2 blocks so far running with 11 threads.
Found a block with primecoin0712 (v1 build for avx from Sunny's 0.1.1 updated code - from another thread) and also found a block with the v2 build before switching to v3. pps is around 2200 to 2500.
Maybe a bit of luck, but just confirming that I've found blocks with all three builds. I've not experienced any network or block 'lag' either (yet), as reported elsewhere with those builds. Seems to be all OK to me, until I find time to review and build.