Etrex30 buttons finally failed today. Approx £90 including Special Delivery to RMA, they provide a new outer casing and refurbed innards. No option to upgrade to the later Etrex 30x. All posted off - I'll let you know how long it takes. (They are very good on the phone once you get through to them: I got quite a nice 30 minute classical concert on the muzak tape before being answered.
I found a YouTube video (Polish) demonstrating startup times, time to display new map scales etc for the 30 and 30x. In all cases the 30x was slower than the 30, suggesting that although they increasd the number of pixels, they kept the original computing power.
One new feature on the 30x which I only saw reported on one video:- if you nudge the joystick to give the intermediate brightness you require, then press the joystick, the system will remember your new chosen intermediate brightness next time it is switched on, so you could then switch between, say, 0%, 25% and 100%, rather than the original 0%, 50% and 100%. May appeal to the nightriders.
Bryn