I have a concrete grievance since acquisition...
They've started to dump crap into the Lastpass Vault. First it was adverts and then they modified the search bar to search the web rather than only your saved passwords/notes. Both attempts at gaining advertising/referral revenue and in my opinion at the cost of security.
I've disabled the idiotic search and was paying for Lastpass Premium before so don't see the ads but it is the principle that the company now places minor revenue over what I consider security which I cannot stand.
Plus I had issues with LogMeIn's business practices previously and moved to a competitor. Only to now have them follow me by buying Lastpass. I am in the early stages of looking at moving away from Lastpass (after four years).