How much playtesting for UT2007 goes on at Epic?

We playtest it every day. Playtesting early in production can sometimes be a challenge because it's ugly or doesn't run well, but what we do is catch little movement things. For example, we felt that the Manta craft was flying too low and conforming to the terrain too much, which was kinda nauseating. We raised the Manta up slightly, so now you feel really good when you're flying around, and when you jump, you feel like you're jumping. You have to have vehicles that are fun to drive even if there's nothing else going on.