Want to purchase a reliable one. Many have good reviews but say they are not Mac compatible.
Must be Mac compatible for me. Any suggestions?

I'll qualify my recommendation by saying my current camera is 7 yrs old and things have surely changed significantly since then.

In 2006 I converted my property to wildlife management, which requires several activities to qualify for favorable tax consideration. One is supplemental feed, another is census counts. I set up a 2,000 lb protein feeder for the former, and I use a game camera at the protein feeder for the latter. My first camera was a Bushnell - cheap and simple. After a few months of only 80-90 pics per month, despite 2,000 lbs of feed disappearing in 20-25 days, I tried a Moultrie. The difference was amazing. The photos overloaded the disk and I had to set a 5 min delay after a picture was taken to avoid running out of space. The picture quality was great, and I was capturing several thousand pics per month. After 2 yrs, however, the LCD display went out. I purchased another, but it was slightly different - the brass knobs for accessing the internals were now plastic, and after 2 months the LCD display went out. The store where I purchased it gave me another, and it only lasted 1 month.

I gave up on Moultrie and tried Cuddeback. The model I tried was simple and straightforward, but picture quality sucked and it didn't capture nearly as many photos as the Moultrie.

Then I bought the most expensive camera offered at the time - Reconyx. At the beginning of 2009, they wanted almost $600 for it. Figured I see if you really do get what you pay for. Long story made slightly shorter - I'm still using that same camera today - 7 years later. I've run it continuously, literally, since I purchased it. It averages 3,200 - 3,500 pics per month - so its approaching 270,000 - 300,000 pictures so far. Runs on 6 C batteries, and these will last almost 2 months at the rate pictures are taken at the protein feeder. The thermometer (shows the temp on the pics) started getting way off about 2 yrs ago, but the rest has been flawless. IR pic distance is great at night, and hopefully the new models are even better 7 yrs later.

Not sure about "Mac Compatibility" given the age of my camera, but the age of my camera should speak volumes about its reliability.

They record pics on a card. Usually an SD card. Macs will read SD cards like any other computer. The card is just storage of jpeg format images.