The other thing is their history - they have had 4 or 5 generations of DCC systems, each one not in any way compatible with the previous one, so if you upgraded, the pld one was pretty much useless. The current lineup, they finally learned, and you can start with a Prodigy Express and get to the Prodigy Wireless without throwing anything out. Their previous policy of not allow JMRI to work with their system also generated a lot of flack, for good reason. Every other well known system out there worked with it. Looks like MRC saw the error of their ways and has since reversed that position and now JMRI is supported.
Contrast to the two most popular (in the US anyway), NCE and Digitrax - they have always been expandable, old stuff from the beginning days of DCC will still work with today's systems.
Their decoders, as David said, have always been not worth the trouble. Some of the features they loudly tout, like having 16 horns selectable by a CV, are wonderful - except the documentation doesn't tell you what horn you get for a given value of the CV, and their tech support flat out stated when I called that they don't record that information. So, you designed a complex piece of electronics and didn't document it?
The other turn off for people about MRC is their over the top advertising. No, no one expects a company to take out ads theat say "Hey, our product is GOOD ENOUGH!" but MRC claims they are the best and first in a lot of things with no evidence backing that up, and the reasons they give in the ads aren;t necessarily accurate or even a positive point about the product. But this is nothing new, they had ads like that back when the Goolden Throttlepack 501 was the latest and greatest.
Then there are the little things they negelct to mention, like if you build a big enough system, you will need powered fascia plates to plug throttles in to, and MRC does have them - they are double the cost of similar NCE and Digitrax products. So you might start out cheaper, but for a large operating layout, it may cost more in the long run. And the others are complete systems - not just the throttle and train control, but detection and signalling as well (at least with Digitrax).
--Randy
Modeling the Reading Railroad in the 1950's
Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.