It's good, but I get some hot spots after 4-5 hours of use. A bit of discomfort but not enough to annoy. One earpiece could be wiggled slightly while the other sat snug enough that I couldn't wiggle it when a seal is formed. Was thinking of sending them back for a refit, but I've waited ages for them, so I'll be living with what I have now.
Also, some minor itching sometimes.
Refit turn around time is usually about a week to 10 days, so you wouldn't have to wait too long for that. If you're unsure and you're still within the 30 day refit guarantee, I'd consider getting a refit done, as the whole point of customs is that they fit perfectly.