I'd still be interested in getting twin 755SA's if they were available for a reasonable price. At current pricing though, not worth it for me.
I still have Plextor drives in the system I built for my wife. Plextor UltraPlex 40xMax CD-ROM and Plextor Plexwriter 12/10/32, both SCSI. The fastest Plextor SCSI writers still command quite the premium on Ebay; I got two for a deal on a forum, and sold one (which paid for both of them). They work well, but oddly enough, the CD-ROM won't rip audio CD's to iTunes; only the writer will. It may lead me to swap them out soon and go standard IDE.
Their CD-ROM drives and writers in the SCSI era were the best-built drives in the business, but also the priciest. I think Plextor's first hurt was their interminable wait in coming out with DVD-ROM drives (by the time they did, others had that market), and eventually outsourcing to reduce costs, but not reducing prices. Several of their more recent drives needed firmware updates to work well that were a long time coming, too (compared to older product that "just worked" right out of the box).
I'll be sad to see them go...but I won't say I didn't see it coming.
Intel Q9450 @3.2GHz, Gigabyte GA EP45-UD3P, 4 x 2GB G.Skill @4-4-4-12
Antec P160SW case (modded), Xigmatek 750w PSU
3x 500GB (RAID-5), , OptiArc 7200S, ASUS E818A3T
Creative X-Fi XtremeGamer, Hauppauge HVR-1800, Radeon 4890