In reply to Lynsety:
I think for these models the main factor with how quickly it gets a satellite fix is whether you've recently synced it.
With mine (a 220, which is the 225 but without the heart rate sensor), if it's talked to my phone or been plugged into the computer in the last five days it gets a fix within five seconds or so. If I've forgotten to sync it, the longest it takes (in amongst awkward tall buildings) is about three minutes. Every time I do forget it's annoying to the point where I'm slightly better at remembering in future.
Personally, I prefer the heart rate chest strap to having an optical sensor on the watch, so given the 225/230 choice, I'd go 230.
