Doc, I don't really prefer any M-14 platform over another, I like them all. I just don't like someone attitude who came on this thread bashing M1A. I shoot guns since 49+ years and I can tell that I saw horrific stories with every brand of firearms. We must remember that firearms are mechanic devices and it will fail one day.
P.S. I saw a rifle build you did and I can tell that she was awesome.
I take a differing view. The OP wanted people with M1A experience to comment on them. If you dislike the comments people have, I feel for you, but when people who own or have owned them come up with stories that aren't flattering, you ought not take it personally.
Ignoring the comments that simply tell people to buy brand X (insert Norinco, Polytech, LRB, etc. where the X is), there are still a lot of people telling the OP that SAI has built some pretty poor quality M1A during certain time periods. Don't take just their word for it, go to the US M1A/M14 forums and they have stickies warning people of which bolt codes to avoid due to documented hardness issues, which receiver serial number ranges are known to be improperly machined, how to ID cast, Taiwanese or Chinese parts on your recent manufacture M1A and a good chronology of when SAI stopped using GI parts for most major assemblies.
If the OP finds an M1A with mostly GI parts (op rod, trigger group and bolt being the most important bits) and that passes the tilt test and does not have peening on the op rod shelf from bolt roller slap, I would tell him to buy it. If what I just said is Chinese to him, he should have a knowledgeable M1A shooter look the rifle over for him before buying. If it's good to go, slap your money down - it will most likely be a fine rifle.
Here's the rub though - the new SAI's cost MORE than a used one with good GI parts on it. The new rifles, in general, have little or no GI parts. In fact, other than barrelled receiver, most parts are ASIAN (!horrors of horrors!). I doubt most buyers realize this and assume the whole thing is made in the states and therefore better than an Asian Norc. Interestingly, the receivers are cast in Montreal - not even USA made. The next challenge is getting one at all these days. Canadian imports are sporadic at best.
I have, as stated, owned two SAI's since I first got into M14 shooting in the 1980's. I've also owned real M14's and have worked on almost all the M14 makes except for the more recent American brands (LRB, Fulton, 762mm). On my own M1A's, I'm batting 50% with a sample size of two. On guns I worked on for other competitors, back in the day, I almost never saw problems with M1A's. After the M14 became a prohib though, which happened to coincide with SAI running out of a lot of GI parts, I began to see a LOT of competitors receiving M1A's with issues that should never have made it out of the factory.
I still stand by my advice - look for an older M1A - it's likely a nice rifle.