I have been playing my GB pro for a year. I still really enjpy it, but it is a tough game and can be frustrating. It's akin to the Dark Souls video games series, punishingly hard but oh-so satisfying when you do well.
I don't really have any of the issues a lot of people discuss (airballs, outlane rail jumps, SDTM drains etc). My only complaint is that it is somewhat linear and since it's hard unless you're willing to "play better" newbies tend to see the same stuff over and over. Also the strategy is all based on nailing the 6X multipliers which means a good game doesn't mean anything unless you've lit that up. Hoping a code update does come and shake things up a bit.
Overall the package is fantastic, it's gorgeous and sounds amazing. Plays hard which gives it longevity in a home environment.