Thanks for responding. I am not making a switch to 2 rail, I am just enthralled with the LokSound files and wanted to trains that use them. I happen to have 3 locomotives that would be good candidates for LokSound decoders. Like I said in my OP, it is absurd to add another command system to a layout just for better sounding locomotives, and I can't really afford to do it right now anyway. However, I wanted to gather some info on the ESU system from someone who used it.
Where did you end up purchasing your ECoS?
I got my ECoS from Eurolokshop (www.tee-usa.com) & I highly recommend them. 2 years ago, when I bought mine, they had it for the lowest price. Apparently, they drop-shipped it to the customer directly from ESU’s US facility & were able to offer it at least $50 cheaper than the next online merchant. I used to buy models of European trains from them when I dabbled in HO-Scale & always had positive shopping experiences with them.
These are just my opinion,