Default What to know / check on this tab before to pay in store?

I really want this tab and i need to know what is their problems and what to look in a store. Any advise are apreciated. Thanks.

Sent from HTC One 802w Dual Sim with my hand...

Silver hTc One 802w Dual Sim 32 Gb + 64 Gb SdCard
S-Off ; Rooted ; SuperCID; Tommy KitKat SixSense ROM ( pm for that ); TWRP

Past Smartphone's:

Galaxy S4 i9500
HTC Sensation XE
hTC Diamond II
hTC Diamond
Gigabyte GSmart i120