M&P-10-
Good- Forged 7075 upper & lower receivers. 4140 melonited barrel with 1:10 R5 rifling. All controls ambidextrous. M4 adjustable stock. Uses 20 rnd PMags. Light for a 308 AR, S&W claims 7.7 lbs. Actual weight with the M4 buttstock swapped out for a CTR, A2 grip for a Magpul MOE, sling and Aimpoint H1 added, no ammo no mag is 8.5 lbs. a fully loaded Magpul mag brings it up to 10 lbs
Bad- Base model doesn't come with sights, some come only with one 10 round mag. Flash hider is much too long
Ugly- With the added recoil of the 308, the M4 stock is uncomfortable and will grow more so with each shot. Change it for something like the Magpul MOE or CTR with the thick recoil pad
Retail price for base model- $1600. Often sells for less. S&W also makes the M&P-10 available with all Magpul furniture and sights but it retails at $1800 or so and is harder to find
Overall, it's the best value of any 308 AR on the market. Get one, you'll like it. If you don't, you can sell it fast