I've had my Ace since March and have ridden it hard. Frame has been great.
2 weeks ago I was practicing bunny hops over a curb. I got lazy and ended up dropping the rear tire right on the corner of the curb. Tire instantly deflated. I got the rim off, tube was gashed open, rim had a nice dent on the wall and broke a spoke.
The frame though, had no damage at all. So far, it's held up perfectly. I highly recommend the Sette Ace. Although... Sette is releasing a new line of bikes in September... so you might want to wait until then.