I've had the Lab Box since the Kickstarter completed. I also have a few Agfa Rondinax-35, Rondinax-60, and Rondix-35 tanks. They're what I use for nearly all my film processing since 2008.
Compared to the Rondinax-35 and Rondinax-60, the Lab Box works about the same and lets me use the same basic tank for both 35 and 120 formats. There are things about all three that aren't exactly great, but none of them are show stoppers.
The key is that the Lab Box is (presumably) available new and the newest Agfa Rondinax is forty years old or more. Therefore you can presumably get new parts for a Lab Box a bit more easily than for any of the Agfa tanks.
B&H Photo and at least four other US vendors lists the Lab Box as "in Stock", both new and used.
G