Hi all, I bought a Force XL along with brass footers and SubSonic II cable, and I am very pleased with the results. My application is for both single driver speakers (new Omega Compact Hemps) and open headphones (AKG K1000). I own good but not overly expensive gear (Wadia 830, RWA Signature 30), and IMO pretty top shelf cables (Oritek X-2 and AudioPath 8 wire silver).
I've been blogging my experience at Headfi.com...
http://www.head-fi.org/forums/showthread.php?t=244295Previously I owned a Vandersteen 2W, but for my application ACI's controls -- variable cut-off frequency, steep slope, and continuously adjustable phase control -- were needed to achieve good integration.
I am happy with my purchase. Thanks ACI!