On the fence with this one, have been installing LokSound selects in my GP40's and 40-2's and I'm lovin em. Matt @ Loksound was very helpful when a ebay seller refused to stand behind the sale, Matt made it right. So thanks Matt. The kato gp35's with the 567 turbo is nice, LokSound (Matt) is recording the 567 sound, in N. California. Qsi's in the 40's and 40-2's that I have are the best.
While working on the railroad and living in bunk cars the train crews would tie up and park the idiling locos, so that it was almost impossible to get a decent nights sleep, the idiling locos sounded the the qsi's. Trust me if you were in the bunks trying to sleep you might agree. Yes we aked them to park further away but beings they were more concerened about a early quit.....but working in the mow, they paid , could'nt figure out why they worked the whole 12 hrs. Guess that's why the called us maintainence in the way.