There are plenty of PEC naysayers out there but I doubted their "well, you have to guide anyway even with PEC so why bother?" argument. It only took 30 minutes to try out PEC before I was convinced it makes a difference.
The thing to remember, PEC is Pro-active, autoguiding is Re-active. Most mounts will do better using PEC, Then there will be less autoguiding corrections to be made.