Just found this site and thread...
A couple years ago, I bought a Windsor "The Hour" off ebay from bikesdirect. I liked the bike a lot and thought it rode very much like an older Trek 510 that I'd built up as a fixed conversion. The steering was a lot more responsive. Nice bike, held up for the couple months I had it before I sold it due to finances. I converted it to freewheel, added a flat bar and brakes. Nice, light, comfy bike.
About a year ago, I bought a previously owned IRO Mark V. I liked it a lot, but was surprised by the heft of it. Heavier than the Windsor, it felt more planted, but somehow "duller," with less of the springiness of the Windsor. It was, however, much stiffer.
Both were done up with absolute budget parts. I'd recommend the IRO for heavier riders or them what beat on their bikes. The Windsor was fine as an intro to single/fixed riding, and a fun bike to dart around on. Both were used on a regular basis, commuting 7 mi one way. If finances allowed, I'd still have one or the other...