I m using v1 max for last 2 weeks I dint find any issues regarding lagging app crashing or any kind of.bug in the os. the rear camera is above average and front camera is good. It has longlife bettry with 2720 mAh. Regarding heating issue u will not feel it in day to day normal.use it only gets heat up when u play heavy games or heavy online videos.
It has very good sound quality which is awesome it has hi fi chipset for sound camera is so nice like live photos overall very good phone. The phone is available in ?21000 in market. Recommended.