I've had the new specs for about a week now and still haven't really got truly comfortable with them.
I still can' get used to wearing them and looking where I like. In the shop they said you have to use your head a bit more - "looking where your nose is pointing". This means a major re-education of the way you look at things. If you look too low you then start to look through reading glass bit when you want to look at distance objects.
I always seem to try them in the evening when my eyes are a bit tired and then my eyes feel a bit strained. I need to try them in the day so will have to give them a go on the bike! Maybe fit the GPS and see if I can read it!