I am actually disapointed with HTC's update policy. When I read how other companies are busy upgrading their phones, my HTC Desire 600 Dual SIM is not listed for an upgrade even though the phone is hardly a year old. i have been buying HTC phones since the Windows Mobile years (probably 8 HTC phones so far), but now I am really annoyed about being left out of these upgrades. Sure, had I bought an HTC One, I would be fine, but I don't want a phone without memory card slot and the ability to exchange the battery.
I almost bought a Samsung phone, but then they introduced the region lock and that stopped me from buying that (does the region lock still exist).
So I will not be buying any HTC phones anymore, maybe Nexus or Samsung if they have fixed the region lock issue.