I bought one this time last year and I couldn’t be happier. It does a great job at removing most of the dirt and leaves your records static free. Static was the main problem with my Nitty Gritty 1.0. That and the time and effort required to properly clean a record.
In my experience, the Degritter saved some of my records that had previously been practically unlistenable, but not all. It is not a miracle worker. Some records are beyond repair.
So, if you have a large collection (it doesn’t make sense to buy one for a smaller collection if you consider the cost per record to clean), have a decent playback system that will reveal the lower noise floor, and if you have realistic expectations about what the machine can and cannot do, then I can wholeheartedly recommend buying one.