I don't think there is a difference between the poolbuster and poolblaster. I believe they must have changed the name at some point. I bought the Poolbuster CG Max from some website and when the package arrived it said Poolblaster CG Max. I called watertech and they told me that the poolblaster is all they sell. Considering you purchased the CG Max, you already have the best they offer. The poolblaster max (not the CG) for $155 would be a downgrade for you.

I'm not 100% certain of the above so you might want to double check with watertech.

good luck