I can't attest to the accuract - I only had time to do a little informal plinking with it before I left home for the spring semester of college. We've got some catching-up to do over the summer.
However, at RobArm's site, they have some target photos and testimonials.
Mine is one with the thumbhole stock...it comes with a rubber buttpad about an inch thick. It's very nice to shoot...feels like my Enfield. Rocks me back a bit, but not harsh at all.
It's not related to the Dragunov design any more than normal AKs are. I don't know too much about the Dragunovs, but I believe they are fairly different from AKs on the inside. The RPK, however, is just a SAW version of the AK. Sturdier action, longer/heavier barrel, bipod, and 40-round mags.
One word of warning - you may have to do some looking to find a scope mount to a Vepr. You can get one mounted on the receiver cover, but that thing isn't solid enough to be a good platform, IMO. The other option is to get a scope mount that attaches to a piece on the left side of the rifle, and curls up over the top. No el cheapo.
One other thing - as of August, RobArms has a deal with a gunsmith to modify (for $150) the .308 Veprs to take M14 mags. I haven't had this done to mine, but it is intriguing.
Overall, I'm quite happy with mine, but I don't have anything close to the experience that a lot of people here do. If I were you, ks, I'd get a second opinion from someone with more .308 experience.