Is there much difference between LUX TNR 15800001 (Newest) , LUX TNR 15230099(Second REV.) and LUX TNR 10377531(First REV.)?

No difference other than the newer 1500001 ones cooling fan is a different color - flat black on the ones I have seen. They seem to have had more problems too from what I've seen of reconditioned ones on Ebay, but that may not be accurate just an observation.