I have several sets of their FTs. They had some problems initially, but they made good on any problems. IM has excellent customer service; they want you to be happy with what you purchased.
The locomotives are very nice: good runners, well detailed, good paint and lettering. They have very good slow speed control. Based on my experience with the FTs and the IM customer service, I would recommend them to anyone.
The initial adverts suggested that IM was going to do the DCA-1s (the passenger F-3s; there were two A-B-A sets), but they are, in fact, doing the DFA/DFB-2a (early phase freight F-3s). I did speak to the IM representatives at Springfield. They acknowledged that the adverts showed the passenger units, but that their intent all along was to do the freight units. The representatives did indicate that the passenger units as well as the later phase F-3s were still under consideration for later runs.
You do not state what period you model, but if it is before 1961, the NYCS FTs are still out there in lightning stripes, so you might also want to consider them (some of the NYCS FTs did last until 1964, but most went in 1961). Micro-Trains also sells NYCS FTs in 'as delivered' colors.