I do a lot of live looping (Boomerang III looper in combination with the Dwarf) and I also purchased the LP3 plugin, but at the very beginning I encountered some problems with the sync as I described here:
I have to admit, that since then, I havent used the plugin that much, so I cant tell if these problems still exist.
But the first and most important thing for me would be stable midi-synced-looping.
Concerning behaviour/usuability: I really like the concept of the Boomerang (https://drive.google.com/file/d/1ZpK889VhSexRXWyPspHyrLBigxhvFszI/view), but perhaps a big part of my affection is due to the familiarization over the years I’m using it. There are also some really cool features implemented, like a copy function or quantization (“When an external MIDI clock is present, the loops will be quantized to the nearest quarter note, i.e. recording will start and end on the MIDI quarter note closest to your loop button tap. When playing a stopped loop, it will start on the nearest quarter note following a loop button tap.”). One drawback of the Boomerang is that you only could erase the last stacked/overdubbed part..
Perhaps some of mentioned features could be implemented into the LP3 as well, if not already done.. I’ll have to do some more test with the LP3, to go into further detail.