inspector

Does anybody have experience (good and bad) with the Forster's Case and Cartridge Inspector? If possible can you compare/contrast with the Redding Neck Gauge (sorry sounds like a essay question). How much of a benefit do you get from this from a reloading standpoint?

Has anybody used one and do you like it? I am debating buying one. I was looking at the sinclair Concentricity tool and neck sorting tool. But the Forster one does both and is a lot cheaper. Any help is appreciated. Thanks, Joe