Our firm sounds very similar in size to yours. We tried it for about a month last year hoping that it would process/calculate quicker than our server. There was no noticeable difference. They use Rightnetworks as a remote desktop. Because we already log in to our server via remote desktop, it made navigating more difficult using two remote desktops and our local desktop, and so we ditched it. The conversion took about a day. Converting back took less time. A scary issue occurred during the end of the conversion process. Another CPA firm's clients began to proforma in to ours which defeated the whole "more secure" aspect of hosting. I never got an explanation as how it happened.