I've used Powerblocks before and they’re solid. Bought the Pro 100 set and these are more comfortable than previous models I've tried. They provide more room for your wrist and arm compared to other versions with narrower hand sections. I rated them 3 stars instead of 5 for two reasons: The description says "Choose between knurled steel grip or TPR rubber grip," but mine did not ship with the rubber grip. There was no option to select a grip style when ordering, so I assumed that both style grips would be included. But these only came with the knurled grips. While I like them, I would have liked the chance to try the rubber grips as well. I also wanted the Pro 100 Straight Bar and Easy Curl Bar attachments for barbell-style workouts. These have been sold out/unavailable on the website since I ordered the weights at the beginning of August. It's now the end of August, and these accessories are still unavailable. A big reason I chose Powerblocks was for the barbell flexibility. With no ETA on when they will be back in stock, this has delayed my workouts, especially for deadlifts and squats. Overall, the dumbbells themselves are good, but the missing grip option and unavailable accessories really hurt the experience.