There cheap ? If they do a good job of charging and dont over charge all should be good .
No1 problem with cheap chargers is overcharging , a lot of folk get antsy when the charger goes over 4,2volts .
The "Since" charger is a nice RCR123A charger , but not dual channel .
My Ultrafire WF-138 is also a nice RCR123A charger , and works well for me .
I have a WF-139 that works well with protected cells , but goes slightly over 4.2 with unprotected ones ..
dx/sku.936 is a 18650 charger and has never gone over 4.2 . but is single channel .
Im waiting on a 5th charger ATM , which will be a mod project ...