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I have Netatmo too (in fact I've just bought it again after I moved).
Installed it myself, there's a few different options depending on the different wiring so it's pretty easy. Took me ten minutes the second time round.
No fees. The thermostat is at the cheaper end but valves are pricey if you want to outfit the whole house (although none of the systems are particularly cheap for valves).
There's some similar chat on the internet of things thread.
I think Nest tries to "learn" how you set your heating over time so it does that automatically for you. Never appealed to me. I ain't havin' no skynet tell me when I'm supposed to be snuggly warm!
Did you install the Netatmo yourself? We currently have Hive but only because we used to be with BG and they had an offer where we got it for free (including installation). It syncs well with Alexa, but I've found I use that less and less. Just a shortcut on my phone homescreen.
Are there any recurring fees?