I planned a bachelor party for about 15 guys and went with VIP UNLTD. Andrew hooked us up - we got into great clubs (Light at Mandalay Bay, Mix at The Hotel, Hyde and the Bank at Bellagio). We waited in lines for a total of 15 minutes. Everyone had a great time!
Pros: Convenient way to get into clubs, especially for a group of all guys (although the girls from other groups that night enjoyed themselves too)
Cons: Have to meet by 10:30pm (may be early for some groups)
Overall: We had a time and Andrew was great to work with. I'd do it again!