I put a boomkicker on one of my previous boats. It worked well as advertised, but.........
1. I could no longer depend on the boom as a handhold when coming back down into the cockpit after going forward, the boom just drops if you put any weight on it.
2. I found it made it a bit more difficult to reef or put the sail cover on in rougher waters as the boom was bouncing up and down.
3. When motoring under bare poles in a big chop or wakes the boom will bounce wildly up and down, the vang does not allow it to above horizontal but the boom drops down into the cockpit and the shoots up until it is stopped by the vang.
I would not recommend one to a friend, just a few points to consider before pulling the trigger.....
good luck, Bob