The indoor range I went to today
http://migunshows.com/totalhome.html has a great collection of handguns on display and quite a few used ones. They let you rent a used one for trial on their range. If you buy the rental fee is waived. They didn't have a Taurus Tracker or S&W 617 in the used collection, but did have a Dan Wesson model 15 that I tried out by running 60 rounds through it.
It was fun to shoot, the action seemed a bit tricky to open, and most of the flutes on the cylinders had some tacky deposit in them. It also had a distinct cylinder dragline <sic?>. As for the sticky/tricky action, all three of the guys in the shop looked at it and agreed that acted like it was a DW, and that's how they are. I definitely liked the look of the wood grips and the fit of it in my hand, but passed on buying it right then and there. They were asking $398, and told me they would go down to $370 (if you buy it today).
Although they didn't have much of anything Taurus used, they did have a couple of S&W 15's and a 10 in 38 (and/or 357, through which I could shoot 38). Would it be worth renting those to get a feel for them? One of them had newer grips formed for finger placement (the guy at the store said the new ones come like that) and it seemed to fit my hands well.
It was also interesting for me to alternately shoot 6 rounds out of the DW and 6 out of the Detective Special. Both seem to have very smooth triggers. The 38 is much more surprising when it breaks. So much so, that I tended to pull the trigger a bit too fast in anticipation of what was coming. This tendency on my part made it much easier/more enjoyable for me to fire the DW in double action than the Detective Special.
FWIW, they need one week to get me either of the 6" 22s I could buy new from them: the Taurus Tracker for $375, or the S&W 617 for $570.