I have a 255 music and just bought a 165 music (I don't really use most of the extra bits the 255 does and wanted an AMOLED screen). The 165 can show a max of 4 data fields on one page and I assumed it would have the same up to 4 data field options as the 255. Sadly not - the 255 has 8 and the 165 has only 5 and the one I use (the T shaped one) is not one of them. To most, this possibly wouldn't be a big deal but if I've used this layout for all runs and then it's gone, the watch isn't really any use to be honest. For this reason, I've returned it.
I called Garmin to query this before I returned it and was just told the 2 watches have different software on them. I have sent feedback on it to Garmin and don't know how easy/difficult this would be to fix it with a software update. I had a brief look on the Connect store and couldn't see a way of downloading a new data layout in the format I want.
Has anyone experienced this or maybe it's just me ?