Piston Ring Gapping Tool

[BLACK'98DSM]

I'd like to add one of these to my tool collection:

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I've always filed mine by hand. This seems like a handy tool, I'm wondering if anyone else uses one and what your thoughts are

 

[1990TSIAWDTALON]

I have one exactly like that Solomon. I mounted it to a 4x4 block of wood. It works good, you just have to hold the ring down with a finger and work slow (usually the 2nd ring is softer than the top ring but not always).
I wanted the powered model but this one cuts just fine and keeps you from getting too much gap too soon.
I've used it since I got into the DSM engines, so a few years now, and I used it on the latest SBC build for Trevors car too.