No problems with any 4th Gen iPad mini and Foreflight. Battery does go fairly fast but 12v chargers make that a non issue. I literally only use it for Foreflight and inflight IFE and otherwise it sits idle. Coming from Android I really dislike how it's stuck with all these random apps and everything is tied to my Apple account while I can run an android product off a burner account. Apple feels a lot more like "you HAVE to do it this way" and I don't even use a cellular plan just run it off my phone's internet or the airplane's wifi as the Cessna's I fly have transponders it can connect to. That is pretty cool and allows me to put the bare minimum in money and effort into having an ipad for Foreflight and Navigraph.
On that note, the vast majority of features on Foreflight don't really matter to me. Flightradar24 already tracks my flights accurately enough if I care, the planes have TCAS, ect. Charts, frequencies, airspace and weather are nice. Both times I've flown with other club pilots recently, they were like "you aren't going to spend 5 mins with the engine running setting it up Foreflight to enable all these parameters to be tracked?". I was like "Uh, it knows where we are and I can get airport info. Mission accomplished" lol. I don't even have a mount for it. I used paper charts until last year, I just look at it for reference the same way I'd look at a chart. There is enough magenta • in the plane if I need it, but the GPS in most of these planes is very expired since everyone has Foreflight LOL.
