I have MPS 4.0 and upgrade to 4.1 was $299 for longest time under loyalty offers. Only difference is RX 9 standard. MPS 4.1 should’ve been free in my opinion or at very least under $80 for sure from 4.0. Today it says upgrade is on sale for $149. Izotope is cuckoo. Main point is $299 for MPS4.1 is not a bad deal.