TL;DR - Get it if you don't mind a couple of small issues.
And now the full review:
This is good, in general. However it has some ♥♥♥♥ling problems which don't ruin the experience but they are problems nonetheless.
Great exterior model
Detailed cab view
Comes with a variety of wagons
Looks as ugly as it does in real life
Was co-developed with Oovee (AFAIK)
Sounds - the engine sounds OK (although a touch to bassy), random sounds seem to cut in and out occasionally, and the horn - oh, the horn.... The horn's end sounds match the wrong horn tone! So the low horn ends with a high pitch and vice versa
Limited functionality - this loco has a lot of systems which I would have liked to have seen integrated into this
Physics - they're just wrong
Overall: This is good-ish. I'm pretty happy I bought it however it needs some fixing. But, considering this was released over three years ago now, it's pretty darn good considering the quality of some other DLC that was put out around that time.