That is the sort of stuff I need to hear. Did the seals just need to be upgraded once with a better ring or what? They only have 30 round magazines, so ROF is irrelevant for the most part to me. Thats really the only downside I've seen so far, unless I'm retarded and there are midcaps out there.
All of WE's GBBR's (and most other GBBR's in general have the same issues). They shoot far too hot stock (often over 500 on Co2), they use far too much gas which causes cool down), they break far too often (ask Hector about his AGM M4), they are fairly inaccurate. The KJW M4 with Travis' parts seem to be about the only GBBR around that's achieved any sort of reliability.
However, even then, you are still talking about buying a $400 gun that uses $40 mags and immediately having to upgrade it just so it doesn't blow itself up.
G&P WOC's are about $600, require very little modding for reliability, and shoot about 360 w/ .25's out of the box on Propane/Green Gas. Mags are the expensive part.
I've since spent far more on my WOC, but she'll be worth it once I get to using her.
Eventually the bolt stop area on the Bolt Carrier will wear out, so will the nozzle tip (and consequently the nozzle too), another 260$ on the RA Tech Steel Bolt + NPAS and aluminum nozzle portion should get you up and running with very little headache.
I also hear that the Viper Tech GBBr's are not horifyingly bad, and should be very reliable (considering there is video of a guy cycling the dang thing for 10 minutes using an HPA rig with only one stoppage which was cured by racking the bolt again) and the price is reasonable too.
As for the WE Scar? I've only ever seen three, and all three have the same issues regarding the stock breaking off, which WE supposedly fixed in the newest generations. They seemed like decent bits of kit, but I never saw one shot at any sort of range so I can't comment on long range performance.