I've used various brands of roll on wax and the best has always been clean + easy.
All the other brands I've tried have had issues such as difficult to clean the heater, wax too runny or hot, wax too cold, poor thermostatic control.
Now i just always stick with c + e and have no problems with the wax not being perfect the moment i want to use it on a client.
The heat up time from cold is 1 hour or less.
They do a whole range of wax types now to choose from which is handy, but start with original perhaps. I find there is no wastage of wax as you just pour the little bits into another cartridge to use again.