don't own it myself yet but soon .....have heavily researched this Device and there seems to be one issue arising on some of these 134 Mini Units after using for awhile , "humming and or vibrating"....and i was given this information,
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Just wanted to let you know about something... I took my Mini 134 to the shop where I picked it up used at and talked with the guy who sold it to me. He showed me the way to fix the vibration/humming issue. Apparently if there's a gap in between the tube and the firing pin area, that's what causes it. You just have to make sure that the tightening screw is completely tight and all the vibrations go away.
Additionally, talked to another guy who has both the regular and mini 134 and he recommended taking a brass brush (from a gun cleaning kit) and rubbing over the 3 pins in the tube and that'll fix it up as well. Haven't tried that part yet as I haven't gotten any of the vibrations since I got the tightening screw set up with no gap.
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thought this info might be able to help you down the road if this issue should arise, other than that personally i think you made an excellent choice.....this one is Next on my list.
...enjoy