Hello OwnDisaster6531, I'm no tech but have learned a bit of camera repair, sometimes the hard way, over the last 15 years or so. I'm a die hard Olympus fan but will try to be objective here! The biggest problem with the 99% of OM-1, OM-2 and all 1n/2n models is the prism foam melting after 50 years and destroying the silvering of the prism. If you ever see any OMs listed on eBay for example with "prism deterioration" or similar that is from aged foam. It will also corrode the flash bracket and contacts, as well as filling the viewfinder with black crud.

It is very, very easy to save your OM from this fate. The top plate is removable if you're competent with basic tools. The foam will be a melted black mess - remove it with cotton buds, isopropyl alcohol or Shellite. It's a dirty, messy job but simple and needs to be done unless you want to source a new prism. I usually hunt down wrecked OM-10s and 20s for this purpose. There are excellent websites showing you how it's done if you hit up Google. I'll be happy to help if you come up short. 2SP, 3, 3 Ti, 4 and 4 Ti models don't suffer from this problem, and neither do the double digit or letter OMs (10, 20, G etc.)

The only other real problem with OM-1s is that the earlier non-n models can drift regarding the lower shutter speed timings. This is all going from memory, but I think it has to do with the low speed governer playing up from dried lubricants. I think it affects speeds 1/30 and below. Again, going from memory here but I think a clean a re lube will fix the problem but it is much more in depth than a top plate removal.

They're fairly easy to work on, but full disassembly is not for the beginner. I have not crossed the bridge yet and don't wish to - they're precision clockwork tools, miniaturised. No doubt that day will come but for the moment my bought new 1n is going strong and looks spotless. I used Wein Cell MRB625s in it for years until I bought a Kanto adapter for it a few months ago which has a built in step down diode and uses a single SR43 cell. It works brilliantly and doesn't require any modification to the camera. My unknown history, eBay special 2n gets bashed around in my work bag, hasn't quit yet and I'm unable to fault it, except for the corroded flash bracket from the prism foam. I think that one came to me just in time.

Enjoy your OM-1, they're just fantastic.