If you get one of these, make sure all the hardware is tightened well. The threaded collar shown in the pic became loose in mine. Still fired but was very weak which led me to discover the issue. Snugged it back up and it's running great.

The positive leaf contact is already exhibiting some pitting from what I assume is from arcing. I put some DeoxIT Gold on the contact area to hopefully slow any surface deterioration. Cheap plated contacts don't usually stand the test of time. These probably would be better with just raw copper contacts.

And, lastly, the two piece doors are kind of stupid. I guess they designed it this way to show off your battery wrap?

Time will tell how well this little guy holds up.