We have been selling the new code 55 track since it was introduced and among the N Scale crowd, it has drawn mixed reviews.
Most prefer the old tried and true Atlas code 80 and we always start our new modelers off with it, as it is pretty hard to go wrong with it.
Some eventually go to the Peco code 80 and, more reciently, with the Peco code 55, Indeed, it has become the track of choice among our local NTrak and oNeTrak members, myself included, as it is the most sturdy of all available N Scale track

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That being said, we have a core group serious modelers, who use the new Atlas code 55 exclusivly for their home layouts and, as such I have difficulty keeping it in stock.
Personally, I went to low profile wheels, starting in 1989 and have converted my entire (substantial) fleet of rolling stock since.
I started using code 55 track in 1988 using, first Railcraft followed by Micro Engineering and, when I start my new layout after I move into our new house, I will be using a combination of the old RC/ME track as well as Atlas code 55.
Now that Microtrains is including the low profile wheels with all new releases, I keep 2 bins of wheels in the store, one each of MT standard and low profile and I encourage the modelers to exchange the low profile for standard and vice-versa accoding to their needs and, in a few months, I will have a good idea as to how many modelers prefer what.
As for the issue of incompatibility of the low profile wheels, I have a habit of weighting my rolling stock in accordance with the NMRA RP20.1 practice, and, as I body mount the couplers on most of my rolling stock, I have had very few problems with keeping everything on the tracks, Including all of our NTrak and oNeTrak club modules

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The Atlas code 55 track is not for everybody, however I beleve that it will increase in popularity and will establish its own following, as all other brands and sizes have in the past.
Terry