The recent firmware update to the 350 seems to have slowed it down. It used to be more like 2-3s.
See this thread:
I've compared the 350 with the 500 and the latter is now much faster.
I refuse to believe they'll leave it in this state for long especially as they're just releasing it in the European markets.
If they do, it'll hit the reviews/word-of-mouth feedback, no question.