Ive just received my iconbit callisto 100 and im pretty blown away with how smooth and responsive it is, its an amazing bit of tech. Im a gadget lover and havent bought it for any specific purpose just as a toy to enjoy and experiment with. I did previously own a sony smartwatch but i wasnt that impressed with it... but this thing wow! It is a fullblown smartphone on your wrist all the things that amazed us all a few years back about our smartphones is now possible on a watch! Live tv, youtube, google earth, sat nav, google streets, stream movies etc from the watch to other devices like tvs or game consoles, upto 32gb sd storage on your wrist, use the watch as a wifi hotspot for your tablet, get all your emails whatsapp text or other messages straight to your wrist, voice search is good, as typing is a little fiddly. Ive just whacked a pay as you go sim in mine and its great. It charges in under an hour and lasts upto 3days light usage.
Only problem i found is the watch mic gets some interference during a call, but with a bluetooth headset its crystal clear. Also its not unusable without the headset, just sounds like a bit of a bad line, fine for "ill be back in 20mins" or "can you grab some milk while your there"... although for long or important conversations i recommend a bluetooth headset.
Ive thrown lots of different apps at this watch in the short time ive had it and it handles most very well. I think the screen size and shape is the only reason some apps arent available but most are.
This watch benchmarks about the same as a samsung galaxy s2. Not bad for a watch!
Sent from my GT-N5100 using xda app-developers app