Jolida/Black Ice Foz XT-R

Is the Foz XT-R worth buying or is it another gimmick that serves no purpose? I've read the reviews and they seem to be divided both good and not so good. I'm presently using the VPI jig and a Mint Protractor for setting up my VPI Scout and ART9 cart but my eyes aren't what they used to be and using these is getting more difficult as time marches on. I'm hoping that the XT-R or a Fozgometer would possibly make set up a little easier for me but I don't want to throw my cash away on something that serves little purpose. I've considered the Fozgometer for a while now but I've read so much about calibration problems with it that I've shied away from getting one. The XT-R would seem to serve a dual purpose as it could be used as both a set up tool and an inline adjustable crosstalk filter, but I've also read that it does little if anything and is a waste of money.