I suppose it depends on what you want to do. If you want to fit loops to the correct tempo and key then I think Live 4 is very capable. I have never found this a problem. If you want to create radical pitching tempo fx then I would use something like RePhrase or some other specialist pitch/timestretch plugin.
Live is for getting everything in time and correct pitch IMO. I don't use it to create extreme pitch/timestretch FX.
By the way Leapfrog's Justin when are you going to have a group buy or do a holiday discount for us?