Comparison of 2009 Lionel Legacy AC6000 diesel and 2010 MTH Proto 2 AC6000?

I have the 2010 MTH CSX AC6000, PS2, 3V board, with cab number 627 as shown. The only complaint I have is with the body. The AC inverter compartment on the fireman's side of the engine has four "X" panels. It should have the bolt on panels as depicted on the real engine. The "X" panels were on later production units. I mention this because MTH did it correctly for their CSX AC4400  engines. Once again, attention to detail. Overall the sound is good with a definite rumble compared to a Dash 8. For the money it was worth it. I can't compare it to the Lionel version but from what I've seen Lionel got the AC side panels right and may have a "super bass" speaker to enhance the sound of a 6000 hp locomotive. The Lionel front coupler sticks out like a battering ram. Appears to be a nice engine but I would not buy one for $699.00.       

I love the Lionel Ac6000 but I'd love to know what made Lionel choose an MSRP of $700 in my opinion it's not worth that much. 

Too much....nice....but too much money$$$$$$$$..

I have a Lionel UP AC6000 non powered engine. It's okay but I prefer the SD70. Only bought it for my 844 train.

I have a Legacy AC6000, in Santa Fe livery. First point is that it NEVER RETAILED FROM A MAIN DEALER for something approaching $700; I don't know why people pay so much attention to Lionel's catalog MSRPs, which don't represent the actual cost from a main dealer. A retailer asking the catalog price either got no discount from Lionel or is content for something to sit on a shelf until it's not available elsewhere.

Mine did cost about $100 more than an MTH version but the differences in terms of sound and accuracy of bodywork are significant and favor the Lionel version.

I believe that Lionel offered a CSX SuperBass unit, which by all accounts gives off booming sound, but I never found anything similar in Santa Fe, which by the way is a fantasy scheme.