I bought the J2K+ for a new paddle with more spin and power than the generic entry paddle I had.
Definitely more power to get deeper returns and drives with a 75% or so controlled swing. Very gritty surface for aggressive dinks, and dwell for putting decent top spin on serves. To be clear, this paddle can do more than my limited skill can push it to. The feel and sound is great. I can hit mid court drops much better with it. Best praise is my coach loves this paddle and can spin a serve off the court consistently. I am feeling good about the purchase and that I can develop new skills with it.