VDR Research

I've been doing some research on virtual data rooms and would love to hear some feedback from others. I setup demos with reps for various cloud based services as I'd like to have alternative options for clients. Some don't have the budget, or don't want to pay the higher fees for Intralinks, Datasite, etc and those platforms seem to be overkill for the mid market stuff I tend to deal with. The one I think I'll be recommending is Caplinked although there were some others that had similar functionality, good reviews, and similar pricing. Caplinked is a US based company whereas the others are Australia (Ansarada), UK (iDeals), Canada (Firmex). Anyone have insight on these and what's your preference from the old standard services?