Well, I finally got down to it: pitting the Flex FX2271 against the Festool RSC 18, with my old DeWalt DW938 as the "control."
I've had the 938 since new in 1998 and it has served me well but was starting to feel a bit "long in the tooth" and with the DeWalt and Milwaukee blades, they would sometimes wiggle the hex screw that held them in place. I think I said this before, but my original intent was to wait until the 938 died and then get the RSC - then Lowes kicking Flex to the curb happened, and I remembered the FOG thread discussing how Festool went to Flex for the RSC.
And like the schematics above showed, the F2271 and the RSC 18 are a bit different. In direct comparison, the RSC is the superior saw in terms of Beast-ness: fast cutting speed, low vibration and just tore through both particulate and pine pallet supports.
I've mainly been using the recip saw to cut down pallets for shop projects and since I need to make some shop cabinets, plywood pallets are a great source that's free. I used all three saws and made similar cuts to tear apart the pallets using Festool Wood Universal 305mm 4,3 blades in each.
While the RSC was handily the tops, the DeWalt with the Festool blade performed admirably and not too far behind the other two. If I didn't get the Flex, I could see myself using the DeWalt for a while to come - with the Festool blades (they were that much better).
But the 2271 was really great. A tad bit slower. A tad bit more vibration. And 1.6 pounds lighter. If the RSC is essentially a clone of the Flex flagship RS 29, then the F2271 is the little brother - and the little brother is tagging close behind.
I even swapped in the Festool DC components onto the 2271 and the DC was pretty much the same as the RSC.
I tend to think of the RSC as a Colonial Marines Pulse Cannon and perhaps the 2271 is the Colonial Marines SAW (squad automatic weapon).
Note: there were four pallets in total. Three of them had the particulate supports and one had pine supports. The RSC blade has more wear because I did enjoy using it and I have to return it tomorrow.