Re: BARRETT M107A1 is it worth it ?
To the OP.... If it's worth it to YOU, then by all means, buy it. Simple as that.
Regarding its quality and accruacy... Many have said it already, and I think anyone here worth their salt will agree... The rifle you use depends on the mission's needs.
If you're putting a round or two into an engine block at long range, the M107A1 is great. Whether or not its the best rifle for the job is a matter of opinion that will change between professionals, but it certainly get the job done.
Now, I (personally) haven't had any issue with the aluminium, but I'm not entirely sold that it was a good evolution on Barrett's part. Really, being four pounds lighter isn't a huge deal for me.
As far as being an accurate rifle, (2moa, 3moa, 6moa, sub .5moa, depending on who's shooting) remember, this weapon was designed to fire 50.BMG into heavy equipment. It was not designed to make headshots at half a mile, so don't expect it to.
Ultimately, its a good weapon IMO. Whether or not it's $10k good is up to you and your cash flow.