i just went through the same process over the past few weeks. was planning on getting a Mirage (between me personally and my employer we've had 8 of them with out issue) but after watching the video of how trails west are made (
http://youtu.be/Ug5K8tNFKb0) i was sold on them. IMO the aluminum would be nice but its hard to justify the price, and trucks now-a-days have more than enough power that i dont feel the added 500ish(?) lbs is a concern. im sure you can custom order a Featherlite to fit my needs (car, rzr etc) but from what i saw they were more expensive for a base model with 3500 lb axles than the one i ordered from TW.
the main reason i would like to go aluminum is corrosion resistance. with that said after watching the process that TW uses for prep/primer/paint i dont think that will be a huge concern for us westerners. my dad built a 4 place enclosed out of steel in 1995-1996. between snowmobiling, moving people, hauling race cars, and materials i wouldnt be surprised if that thing has 100k miles on it. we have never pressure washed the undercarriage like others talk about and it is still road worthy. this year we will probably have to make a new front and rear door because of corrosion but given how much its been through that is not a bad deal IMO. the only reason im not using it this season it he wants it back so i had to grow up and get my own trailer lol
ended up talking to Matt at insteer trailers (MT) and he gave me a great price as well as what i needed for my current mirage enclosed car hauler. have a 28' BP white trailer on the way with a heater (not track melt), 5200lb axles, car package and (2) windows. i work at an HVAC company so i was planning on installing a unit myself but it was under 800 to get a heater installed and that included the tanks and a dual battery set-up so it seemed like a no-brainer. hoping that was a good call. IMO the CB edition is good for someone with out fabrication abilities, or someone that has more money than time. unfortunately cost is a factor for me so i plan on installing my own stereo, racing, etc. option for option it was with-in $500 of mirage and from what i can tell is sturdier.