If you're happy shooting a stock TM @ 280 fps, then it's probably the most reliable gun on the market. THey should last for years without needing anything but basic maintenance.
However, if you have any intentions of upgrading the internals for a higher velocity to make the gun competitive, then you're pretty much going to have to gut the gun and rebuild it from scratch or install an aftermarket reinforced mechbox.
So IMO, TM aren't worth the money. If you're mostly a collector looking to plink at home, they they're worth it. If you intend on gaming it, then I'd look elsewhere. You can get much better for about the same money.