It’s great for an AA light. Not particularly powerful, but if you like Zebras then I imagine you’d like it… and I do! But.
AA is a sacrifice in output and runtime. I have to get something back for that trade-off, and overall footprint is my currency on that one. The fact that the 53 has a head size fairly close to the 64 is an issue for me, so I’m still hunting the best compromise for an AA light. The 53 is very short, but I wouldn’t say it’s particularly narrow (though the body and tail are an excellent size). If that doesn’t scare you off, get it. If you think you’ll want better output, maybe consider an M150 instead.