I've been using a CPE2 (with lift) for the past 18 months, or so, mainly for b&w. However I do use it for color, but have to do a batch job, since chemicals do not last for long when opened.
Did a batch of 3 slide films and 3 print films (cross processing) last night and all went smoothly. I don't think I would have bothered to do this without the CPE2.
As others have already mentioned, the most critical part is calibrating the temperature dial. And do not forget that you are interested in the solutions temp and not the bath temp, so keep the water at a slightly higher temp.
One plus thing when using the CPE2 is that you do have some spare time in-between chemical changes to do other things.
BTW, if you are planning to use the six bath kit for E6 you will need to get the special kit. If you feel OK with the 3 bath kit then the standard setup is OK