What VTT is that good and doesn't just demand a huge amount of detailed work up front to set everything up instead? I ran 4e in Maptool for YEARS, it has FAR more features than any web-based VTT ever dreamed of, and it required MANY hours per week of work to set everything up. Sure, combat could often go pretty fast (I mean, buggy macros and whatnot could kill that promise, but the potential was there). Other than that, it did nothing for play speed, and overall I found that my face-to-face games required 3-5x less prep and went at least as fast, usually faster.