About to begin playtest...
Our group is VERY excited to begin Epic play. We've completed two 3rd Ed campaigns to 20th level in the last two years, operating in different parts of the same campaign world, and they can't wait to see what's been "behind the scenes" pulling the strings in both the campaigns. And of course, beat them up, and take their loot!
Sadly, upon detailed review, our group has agreed that the EPIC rules are not fleshed out to the level of detail necessary for our group to play. So, instead of diving in head first, we are going to run a playtest. Therefore, once a month, at one of our gaming sessions, we're going to be running a one-hour EPIC encounter/scenario, increasing levels each time 24th, 28th, 30th, 32nd, 34th, and 38th...over six months. We are picking up another campaign that is about 9th level, and we hope to get that campaign to around 20th in that time. This will help us get a much better feel for ranges for spell abilities, spell damage, class/prestige class abilities and bonuses, melee and ranged damage ranges, armor class ranges, SR ranges, DR ranges, magic items, etc. We're doing all this so that, hopefully, when the campaign officially takes off into Epic, the DM and players have some general agreement on the power level of everything, at each level.
In our opinion, the EPIC book would work fine if you were going to start up a generic EPIC campaign, but with as many prestige classes and magic items as there are out there, it's unclear how everything should scale up to fit Epic nicely.