Agreed, great locos with immense power!
I'd just add one small note of caution: examples made around the start of the "MTS era", in the very early 2000s, may well have LGB's first-generation 55020 decoder installed - I bought a second-hand green one of that vintage (with factory sound and the aforementioned 55020), and found that it slowed down enormously on curves due to the drag caused by the 8-wheel chassis and the lack of back-EMF on the 55020 chip. Replacing the venerable decoder with a Massoth L, which is a straight plug-in swap, improved the running greatly.
If you find one that is just a little newer than that, say from about 2003 onwards, it is more likely to have the later 55021 decoder with full back-EMF.
Jon.