How many rounds through the $900 M1A ?
If that is new... I'd buy it in a heartbeat.
I enjoy the M1A, while the design is older, it has proven to be very reliable, and while harder then a Large Frame AR to DIY with "improvements"... I love mine.
Look up "Tony Ben" on another site... he has quite a few great videos and info on M1A's... I have seen him diagnose and fix accuracy issues at the range in minutes. ( The shooter had his gas cylinder to far back, causing the front of the stock to bind on the ferrule. Tony saw this in a moment )
https://www.youtube.com/user/tonyben3/videos
My '96 built SAI M21 has never failed to feed, fire and repeat. Never.... that installs a certain confidence for me.
I have had no busted parts, and functions with all surplus ( and over the years that has been quite the assorted brands...) and factory ammo, mine prefers the 168gr bullet over the 175gr.
And my Scoped M21 "balances" better then a comparable weight Large Frame AR. Even with its heavy profile barrel.
I don't shoot it as much as I used to, because me .308 and 6.5CM AR's will remain accurate longer between cleanings.
As long as I do my part, my M21 produces great groups.. for about 150rds, then I need to clean the gas system to get it back to great groups.
Buy quality mags for it... Checkmate is GTG
Given all that I would buy one all over again. Solid firearm and different from a Large Frame AR.