Granted - I'm a tiny account (3 employees). That said, it's frustrating that it takes weeks to get answers to questions (some simple, some less so). When I finally do get someone's attention, the resolution is generally a good one, but it just feels like they're flat-out understaffed on the support side - which is disconcerting when dealing with things like payroll, taxes, etc.
I certainly wish ZP all the best, and perhaps this expansion into new lines of business will help them hire more support staff... but a part of me feels like, "guys, get your house in order first before your start expanding."