Just over a month ago I bought my first arcade machine. It came with a 2006? Neimann trimode 25" horizontal monitor with a no green. Then I bought a steel talons side by side with two WG7000 series 25" monitors for $75 of CL. I brought both the bad wg7000s to a local monitor repair guy and he went through them with a rejuvenator and caps for $85 EACH. I pulled the Niemann out of my first game and replace it with a WG. I replaced the green transistor and reflowed the green resistors on the advice of Dave Niemann in another thread and that didn't fix the trimode. My initial machine is running great with the WG and I have a second WG naked on the bench running great with another PC. Both machines are using Radeon 9200 AGP video cards with soft15khz. One runs through a j-pac and the other is connected directly while I await finding another cabinet to throw it all into.
I'm going to get the Niemann looked at by the same guy some time in the future. So...
No. I do not have an arcade monitor in service over a year.
Yes. The arcade monitors work great with MAME.
Yes. Wells Gardner Monitors are repairable at a reasonable price.
Yes I would recommend an arcade monitor. The one's I'm using are over 20 years old and work GREAT!
Finally, I would recommend being patient buying a non-working cabinet w/ a 25" monitor off CL for next to nothing. With any luck, the monitor will be good and if not, you can get it repaired for around a hundred bucks. Will it last for a couple of decades for you? Maybe, but as long as the tube is good, you can get it repaired pretty cheap and it's pretty easy to pull it from the cabinet. With a new flyback transformer and a cap kit, I'd expect a monitor to remain trouble free for a long time.