I bought one of these a few months back, once I got it set up it's been fine for me but I'm a beginner compared to others here.
Initially I did have some problems, the extending wing on the right didn't line up with the main table and resulted in a wonky fence if I tried to use it across the joint. The solution was to shim behind the fence runners on the main table to bring it out an into line, pennies seem to be the right size. The table insert was also rather low and needed shimming up too.
The riving knife was also a right faff to get on too,