I had been on the lookout for a dependable solution for recording 2 voices (interview/documentary context) for a while and most wireless recorders seem to have either issues with disconnecting (audio dropouts) or ridicuously short battery life.
For those reasons I went for 2 Zoom F2s which I used to record the audio of a documentary (it's on youtube, look for Threetom Modular Visit). The battery seems to last forever, both units were on record almost constantly for about 4 hours without any issues. At some point my interviewee turned off the unit before stopping the recording first, I thought I lost that recording but it turned out this doesn't matter. The units fell, got bumped into, and they kept working great.
The audio quality of the lapel mics isn't the absolute best but they are decent enough that I don't plan on upgrading them right away. There was no clipped audio, and even silent sounds got recorded.
Recording with these units is hassle free, as I hoped. I haven't come across any issues that make me regret my purchase.