I have been using DPA 4060 lavs for a few years now, for both environmental field recording and dialogue recording, and have always been blown away by how much detail they pick up for a miniature microphone!
Recently, for the first time I found myself using some Tram lavs to capture dialogue on a shoot, and I must say I absolutely love them. Although they don't pick up the top-end as well as the 4060s, they seem do deal with the low-mids better and really add a particular warmth that I found to be lacking in the DPA lav mics. I also find them easier to mix with my Rode NTG3 recordings.
After the shoot I decided to see how they performed in capturing ambient sounds, and I must say I'm not all that impressed! the recordings seem quite flat and almost muddy i.e, the air conditioner was too present and thick, and the low and hi frequencies didn't seem as pronounced and solid as what I'm used to with the 4060s.
I'd be VERY interested to hear other peoples experiences and thoughts on the subject.
Marty