I use a Salamander 30/20 combo, and I agree with what JD said about not assisting with sound quality (i.e. not built with isolation in mind), and the rattling perforated panels (which can be adjusted with tape as JD suggested).
I do like the perforated panels because they allow for air circulation while still "hiding" the gear. I looked at all the Salamnder finishes, and I decided black was best for my purposes. The wood finishes, while pretty good, still look a little cheesy, IMO.
I love the infinitely adjustable shelves. Being able to adjust the shelves has allowed me to reconfigure my set-up at least a half a dozen times.
I love the heavy duty Saturn wheels. I move my cabinet all the time, and the heavy duty wheels are lifesavers.
Also, if you are interested in improving isolation, you might be interested in adding Neuance shelves by Greater Ranges. Ken Lyon makes the shelves to custom sizes, and I use one for my digital source. Ken built it to fit like it was made at the factory for the Salamander cabinet.