It's worse than Transmission because it has no mention of any good modern-ish features such as DHT, PEX, LSD(LPD) and it lacks both Linux, OSX and BSD support. Oh and it's banned (not-whitelisted) from all the private trackers.
The first few versions actually had the vanilla Rasterbar-libtorrent peer ID and user agent, and in v0.5 users could opt-in to use PicoTorrent peer ID and user agent, and a few versions after that I made that the default.
I've been in contact with as many private trackers I could find and it's an ongoing effort to discuss with them what they require for whitelisting.
It’s very simple and that makes it effective enough for me. All I’ve got is some arch iso files. A fedora and a CentOS file. It starts instantly and connects to 800 DHT nodes, as opposed to Qbittorrent 2-3 seconds and 350 nodes.
I don’t know about private trackers. I don’t have anything I want to pirate.
I don’t see cross platform as a plus for mini sized, simple graphical applications. I see it as an advanced curl.