I have front and rear, both cycliqs. the fly6 (rear) has been faultless. Only issue is that the time on the internal clock tends to drift, adn needs to be periodically corrected manually. I've never managed to get the app to work satisfactorily, which is supposeed to do it automatically.
The front, fly12, has been consistently problematic. Periodically refusing to switch on, failed to auto-save the footage when I came off on ice, battery life unpredictable (sometimes 6 hours, sometimes 2). Also would reset the date/time/year back to 2015 whcih made it distinctly unhlepful as evidence. I lost one of the port covers and they were unable to supply a replacement, and now after 6 years (although it didn't get used much during covid) refuses to switch on at all.
I returned it under the warranty, but typically it decided to start performing again. Customer service is in Australia, so you can't get timely responses. The typical response I got was to ask me to reformat the memory card. I'm not techy enough to understand why that should make any difference to the hardware... (which, of course, it didn't).
In answer to the original question, yes, two are better than one. I was close passed on Sunday morning with only the rear camera working. the front would have shown that the trailer had no lights or registration.
Neither seem to work particularly well at night, getting easily dazzled, although I imagine that's a problem endemic to all cameras.
Maybe the newer versions are better. They've offered me 20% off a new one as a gesture of goodwill, but given you can usually get them at 10% of anyway, it's not a very generous gesture, and unless my lottery ticket comes good I won't be taking them up on the offer.
In terms of setup, I have the front one mounted underneath a bridge between my aerobars. My little seatpack tends to interfere with the view from the rear, so I used to mount it upside down on the top of the seatstays, but my new pannier rack now interferes with that, so now it's seatpack off and in panniers, and camera back on the seatpost I've experimented with attaching it to the rack supports, but not very successfully as the diameter is too small.
