TG, having read the reviews I passed on the swimovate for the very reasons you mention. From what I've read the 910xt doesn't work in quite the same way as the Swim (DC Rainmaker review I think) , it may be the 910xt is a more reliable piece of kit. I will try Garmin support but from what I've read they are not being very helpful on this.
SD, Before you order I would do a google search under the title Garmin Swim problems. It seems that what I am getting is not untypical for some users and that Garmin are aware but not really doing much. I only looked at wiggle reviews before I ordered and they were generally positive.
Lol, TG that could be it although the fact that I'm being overtaken by octogenarian breast strokers (don't go there) in the slow lane would suggest otherwise.
It started off maybe adding one or two laps and the rest was ok but as I've swum further it's got to the point where in a 20+ lap session only one or two laps have been recorded correctly and I'm not they're correct even then. On the upside it does say I've managed to swim a 12 second 50m so it's not all bad.
I did FF, it should tell you when you connect if anything needs updating but nothing came up. I think I just have a dud. It's adding in about 50% more laps than I'm actually doing and with each swim it's getting less accurate. Back to Wiggle I think.