I love mine. It's been 100% reliable with everything I've put in it. I've only had to change the gas setting once, and that was to get some steel cased to cycle properly. After I changed the setting it ran the ammo perfectly. Ammo with quality ammo for 3 shot groups have proven to be sub-Moa. I have a handload that will stack 5 in a sub-Moa group. Handguard is great, fits in my hand perfectly. Some knock it for having proprietory parts. This would worry me as well if it was any other company but Ruger. For the most part it would be a safe bet if you ever needed a spare part or replacement Ruger will have you covered. The grip is a hogue grip, which I like. So no worries there from me.
My biggest gripe with the rifle is the trigger. It's standard milspec so it's not good. I'm planning on getting an aftermarket trigger as any milspec ar-15 will drop right in.
Also the stock is a standard m4, which with the extra recoil from the .308 makes it unpleasant to shoot. So I swapped that out with an ar-15 milspec magpul CTR with the enhanced buttpad, which fixed that problem.
And lastly, I changed out the standard charging handle for a BCM gunfighter with the large latch. It takes a lot more effort to charge a .308 AR over the standard ar-15. So the large latch BCM remedies that issue. Also comes in handy when scoping it as well.
Overall I'd give it a 4/5. It a great rifle and given the chance I'd buy it again. However it isn't cheap and at the price point they generally sell (got mine for $1450 OTD) I feel like some of the upgrades Ive had to make should have came standard.
After my changes to the rifle I'd give it 5/5. It's exactly what I want out of a .308 AR. And at $1800 including my $230 trigger I have on order I feel it's an overall good value.
Btw, the BUIS sights it ships with are Samson sights, which are superb sights.