I recently decided not to use this expansion any more when playing with my munchkin buddies. Read on and you may decide this expansion is not for you.
I got together with my friends after purchasing a copy of munchkin 7 and shuffling the doors and treasures into my existing munchkin deck (consisting of cards from Munchkin 1-5). My friends had played Munchkin before but our first game that included Munchkin 7 was definitely the worst. The game moved very slowly. We were having a very hard time finding any monsters in our door deck and it seemed like everyone had more wandering monster cards than they knew what to do with. Whenever a monster did come up it was soundly crushed because there were enough cheat cards to go around that everyone was totally overpowered. Consequentially, no one needed to ask for help and the game became a lot less interactive.
After that night I sorted through all of my munchkin cards and did some statistical analysis using Excel. When you combine the first 5 munchkin expansions, the ratio of the different card types pretty closely matches the ratios found in the base set by itself. But once you mix in Cheat With Both Hands, all the ratios get messed up. The probability of finding monsters drops by 6+% etc. That's why I've decided not to use this expansion any more.
If you are combining munchkin fantasy with several other munchkin sets and are looking at truly massive decks, then maybe the effects of adding CWBH won't be so noticeable. But I'm only using fantasy and in my case, Cheat With Both Hands disrupted the relative balance that my munchkin group enjoys.