Your in luck GM, I can tell you pretty much everything you want to know about the Vector MP5/10. First of all, it's a civilian version of the gun and not full auto (although I would guess if you have a registered trigger pack/full auto seer, you could make it full auto (disclaimer - don't own any full auto guns so that's not something I know a lot about).
At any rate, to get back to the Vector - they are not mfg. by Vector, merely being sold by them. The mfg. is a company named Cohaire Arms. They are owned by the wife of the guy who owns Special Weapons, Todd Bailey. Todd is a controversial figure in the HK clone world. On the one hand, he seems to be the only guy who can reliably produce receivers for the civilian market. On the other hand he has the tendency to get into huge pissing contests with anyone who disagrees with him. Doesn't have a good reputation for customer service. (Unlike Vector, which has an excellent reputation)
At any rate the MP5/10 is a Cohaire Arms receiver, Special Weapons parts and is assembled either by Cohaire or Special Weapons (remebering that they are in reality one in the same).
So how do these guns work? Well based on personal experience - I own one - not so great. These are brand new models in which nearly every part had to be reversed engineered from the original HK. This has caused some problems. My gun basically had 29 FTE in 30 rounds. Then the bolt hold open device broke. Oh, it also shot about 6" to the left at 7.5 yards.
Shipped gun back to Vector, who shipped it back to Cohaire/Special Weapons. I do have to say that both Vector and Special Weapons have been very good about giving me updates and they claim gun has been repaired and is not functioning 100% - but I haven't gotten it back yet, so I can't confirm.
I can tell you that if you search the various boards (try HKpro and AR15.com) you will see that others have had very similar problems.
If you still want to buy the gun after reading this (and you might if you really want a 10 MP5, since your only other alternative is to have Murray Urbach make you one for about $10,000) you better contact Vector immediately. Cohaire/Special Weapons has stopped making this gun (and I think they only made about 40-50 of this version, primarily because it has proved to be such a bear).
You can still get this gun in .40S&W, which, based on the reviews I've seen, seem to have fewer problems and be running more reliably.
So, have I answered all your questions?