Their subreddit paints a similarly bleak picture:
https://www.reddit.com/r/coinomi. Lots of posts of people being unable to spend coins, unable to sync, getting a variety of error messages, etc. The comment section for each of those posts is just filled with spam.
Similar thing happen on their play store (Android) if you sort it's review by newest date. Although Coinomi still have 4.5 stars and play store decide to show old review with 4-5 stars.
That happens if you select 'Most Relevant', with "Most Recent" new ones appear.
I know that. My point is user who don't bother check all/recent review would be deceived with what play store shown by default (4.5 stars and review with 4-5 stars).
For Monero, I don't need to keep it on mobile. That was only out of convenience, not because I need it on the go. So Monerujo won't work. I tried the full wallet once (on a server), and it's much more resource intensive than Bitcoin Core, so that's not an option either.
If you don't want to run your own node, then why not just use the GUI wallet from
https://www.getmonero.org/ and connect to a third party node?
Based on my short experience, Feather have better performance/sync time than GUI wallet from getmonero.org though.