Im sure you know much more about the m305 than I do. But I have to disagree with staying away from it. I bought the usual stuff from m14.ca (scope mount, muzzle brake and rod and spring.)got a trigger job done only cause mine was slam firing. And it works just fine for what I want it to do. Hitting an 8" steel plate at 200 yards is good enough for me. If your going for sub moa accuracy than yea, your probably right. But for an affordable .308 semi you can't go wrong.
Oh, I absolutely agree with you, but you have to spend some more time and money and fitting on the base M305. Some people aren't into that and will just hate it for that reason.
Actually, when I bought my first M305, I thought it was a piece of junk and felt I'd been ripped off. Then I did some reading of the stickies, asked some questions on the board, watched a LOT of Youtube videos (thanks Tony Ben!), bought some M14 tools, attended one of Tactical Teacher's clinics (and visited his house a couple times) and now I love this gun and tinkering with it.
I've bought three now. All three tweeked with the usual mods, and one in an M14.ca Blackfeather stock. I still want to unitize the gas cylinders, but I'm told it's not essential so I've held off...for now.
I have sank some money into them in extras though.
NM front sight $35 USD (plus shipping)
NM rear sight $150 from Spcamno
M14.ca Black Arrow spring guide $40
Boyds walnut stock with metal hardware (the springfield buttplates are way nicer) $280
Springfield handguard $20
leather 1907 pattern sling $20
castle nut pliers $15
sadlak gas cylinder lock wrench $25
SEI extended bolt release (can't remember, but Brownells lists it for $57)
spare bolt parts (just in case)
A.R.M.S. #18 scope base about $200 (can't remember exactly)
A.R.M.S. #22 QD scope rings about $150 (can't remember exactly)
Springfield NM flash hider $80
USGI trigger internals (forgot how much)
Tactical Teacher's M14 clinic and a couple sessions at his house (I can't smash off the flash hider at my place)
2 cases of Norinco 7.62 ammo $1000
extra mags $$$
trigger job (by Casey at Tac Ord)
...and that's not even getting into the Blackfeather stock...
EDIT (to put things in perspective): all this extra stuff (not including the Blackfeather stock) plus the M305 for about the same price as a standard, plan Jane Springfield M1A. It pays to tinker a bit with the M305.