Advice 1st garmin 945 vs 745

745 tracks better in my experience. (gnss) it's likely the gnss chip is a different sony model (but from the same class of chipset)

the 745 is smaller hence the antenna is probably also different, be that better or not.

if I wanted to have an equivalent of the 945 should I wait for the 955 to come out?

Yes.

Yeah, if Garmin follows the same pattern as the 945, the 955 is imminent.  If you have to have something for summer training, I'd get the most used, beat up Garmin you can find for pennies just to have something to start with.  

Waiting 7 days would seem a prudent thing to do based on everything I've read online!

is it advisable to buy the new product? just released on June 1st?

rtperna said:

Yeah, if Garmin follows the same pattern as the 945, the 955 is imminent.  If you have to have something for summer training, I'd get the most used, beat up Garmin you can find for pennies just to have something to start with.  

sorry u cant understand, can u explain better?

Well I certainly wouldn't do that after my experience with the 645 which took around 9 months to become stable. However I have read that Garmin's software development process is better now.