NBGS has stopped manufacturing slides as an outside vendor. They sold the rights to the Master Blaster and other products to Whitewater West, who now design and fabricate them.
No offense, but Schlitterbahn did.... mess up quite a bit with Verruckt at Schlitterbahn Kansas City. Sure, its the tallest water slide in the world, but capacity is laughably low and the steps required to ride are ridiculous. You need to book at park opening a time slot. Then, you need to have a group of two or three that weight between 400 and 550 lbs. Once that is settled, you get a time slot and return to the ride. You are reweighted to make sure you did not switch up your group and then are finally allowed to go up the slide tower. At the top, the 3 person raft have individual seats and require riders to wear a 3 point seatbelt. Once that is done, enjoy your experience!
The reason for the low capacity? They can only run 3 rafts as the raft conveyor is underpowered and can only take one raft up at a time.
Meanwhile, you have Proslide who took the water coaster concept, replaced the water jets with Linear Induction Motors and created a much better and high capacity attraction. You can even order it with 6 person rafts for insane capacity. Here is a recent example: