We have over 100 840 Pro's in production in raid arrays on dell perc h710 controllers with no issues. It was tough to move away from legendary intel 320's reliability. Our decision came down to the s3500 and the 840 pros. When we compared the prices and availability between them we chose the samsungs. Been a few months now and so far no issues.
I've seen a lot of bad news with 840P's in RAID (at least with non-Dell controllers). Personally I'd go with Intel.
Experienced some of that bad news first hand ourselves. There are some lengthy threads covering early RAID issues with the 840 Pro. Recent firmware patches supposedly resolved the RAID performance issues, but we're sticking with other brands after our experience with the 840 Pros.
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