beetlemania-
the outriggers are very sweet and very heavy. I have heard the 2.4, 2.4SE and 2.7 models with and without outriggers. To my ears, there is a slightly improved sound and presentation using the outriggers. I venture to report that the difference is not day vs. night. Thiel owners across other Audio forums like Sound Anchors to good effect. Still another option is using maple wood slabs under these speakers as well.
In all of my auditions the rooms were carpet, from the range of, very thin commercial to full on luxury thick.
Happy Listening!