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I know an iPad is a cheap solution but visibility in a cock pit is not good based on my experience, others may differ. You need to be able to see the screen in all lighting conditions. The best tablet I have found is a Nexus 7, but that also has limitations . My $.02
I don’t use Open Flight, but if you do I would like to hear how well it works. Their products look real neat. I use an iPad in my cockpit with Seattle Avionics mapping with a Dynon EFIS. The iPad visibility’s has always been fine. If it occasionally catches a little glare, so what? I fly a put put Plane, not a jet. My flight instructor’s hammered into me that I needed to be able to fly the airplane without instruments if needed. I do not fly IFR.
My observation of glass EFIS systems is that they provide way more information than you really need. Do you really need cylinder head temps on all cylinders? I fly behind a fuel injected engine, exhaust temps are just fluff. Fuel rate of use? Fun, but not once you run a few loads of fuel through your plane it is just bragging rights. Oil temp with a decimal readout? Get real, C172 steam gauge are a floppy needle with just yellow, green, and red with no numbers, been working fine for decades. Just keep it all in perspective.
Do you really need cylinder head temps on all cylinders? I fly behind a fuel injected engine, exhaust temps are just fluff.
Au contraire, mon frere! When you stuff a 6 cylinder, air-cooled engine (Jab 3300) into a slow, high-drag airframe (STOL 750), you definitely need 6-probe CHT/EGT monitoring! :>)
I plan on a Ul 350is in my 750. Cost of the additional probes seems minimal compared to the cost of the engine.
iPads got off to a great start as EFB's and were quickly adopted by pro pilots since they didn't have to lug around a huge, heavy case of paper plates and charts. However, the pro's were/are using them in bizjets and other commercial aircraft that tend to have relatively small windows (subdued lighting and not much glare) and air conditioning (no overheating issues). Also, they were not panel mounted or hard-mounted which allows you to make subtle tilts and vary viewing angles to reduce glare.
In my 750 STOL, I used a Toshiba android tablet for a while (to display GPS moving map), which had an excellent display, but there is simply no comparison to the aviation-quality displays on my MGL XTreme EFIS/EMS and my iFly 740 GPS!
I agree with Jim - tablets are a great supplement but not always the best choice as a primary flight display. Of course, technology marches on and now I can run iFly GPS on my phone and that means I always have a backup GPS in my pocket! :>)