I have a few VIM tools. Some are US, some are Taiwan. All are excellent quality IMO.
The only exception to the above is their low end screwdrivers. They are branded 'Mountain' and definitely chicom. They are better than many of the chicom screwdrivers I've seen, but they aren't a Wiha by any stretch of the imagination. They cost under $1, so I can't complain about it.
Fit and finish is flawless on all the VIM pieces I own, and I use them often.
I don't know about the warranty process as I've not had to use it.
I personally think for the price, some of their items are real sleepers. The hex sockets and socket drive T spinners are tough as nails. The T handle socket drive spinners I have (1/4, 3/8, 1/2 and hex drive) are all very very smooth and at least one of them has Blue Point etched on the shaft.
I don't know if they are an OEM for Blue Point, or they get some of their tools from the same OEM as Blue Point, but in any case, they are excellent and well worth the money spent.