I still wear my Pebble Time Round every day. The form factor is unequaled. Less than 8mm thick is just not where other companies are going with their watches, and I'm sad about that.
I was wearing mine until it fell apart and nothing on the market seems to be a decent replacement... everything else is really clunky and weird looking.
Ditto but for the Pebble 2. I bought a few backups that I can continue using for a few years until something similar is released (week long battery life, easy to read always-on display, hacker friendly, etc).
I have my eye on the PineTime, but it has quite a while to go before it's usable.
I won't get back into wearables until they start slimming down.