Ey I start using it a week ago and its insanely awesome!!! Same UI as whatsapp but a big problem is the day to day use of the app for example right now theres not much community I have got like 10 telegram friends out of 100~ that uses whats app.
Another thing they dont got is the verb conjugation we use for example
" I'll send you a whatsapp " > that stands for Ill send a text message by whatsapp. It became as a native verb.
" Ill send you a telegram " > Right now it doesnt make to my mind what do that means.
In Spanish we like to use a lot
" Te mando un whatsapp " " Hablame por Whatsapp " " Tienes Whatsapp " and the word Telegram doesnt is very friendly as the word "whatsapp"
" Te mando un telegram " "Hablemos por Telegram ".
So I really like the app and the Windows Client is just very nice and good to have
Let's wait and hope people like it.