I have to disagree with Chris, tho' from his avatar that might not be a good idea!
I had exaclty the same combo last year, and once "trained" over 3 nights and using the PEC functionality, the mount would track to well within advertised limits.
If you are going to use an auto guider, I suggest Synta / Orion's own.
These mounts don't like 3rd party software / bits in my experience (YMMV), but I feel a lot of 'problems' with the mounts are caused by not setting them up properly in the first place.
True, they aren't THE most accurate, but they aren't the worst either.