It's the first oo9 model I've owned so please judge my comments in that context. Some pictures below. For a small model, and I've pictured next to an oo Thomas for comparison, it feels a decent weight. It's predominantly die cast. Cylinders and plastic valve gear look clunky to me and, unsurprisingly, there's no back head detail.
I've not seen any of the films nor any of the TV episodes featuring Skarloey so can't comment on how the representation is relative to those sources. I'd rather compare to the original series!
Challenge a is, as most people know, that the Railway Series is inconsistently illustrated. I've open in front of me no10 "Four Little Engines" which is Dalby illustrated. P54 has a nice picture of Skarloey backing down on coaches. I've also got no14 "The Little Old Engine", illustrated by Kenney, open. P60 has a good view of Skarloey. Now as devotees of the series will know, Skarloey is sent for overhaul at the end of no10 which may account for some differences, eg the taller chimney with a copper band in book 14 which is closer to ehat Bachmann has modelled, albeit without a copper band. Front buffer of model is obscured by a coupling, I guess if they use that excuse for a modified hall, what chance does a narrow gauge engine stand! Most glaring point difference I can immediately see is both railway series illustrators show the loco with one tool box on its right hand side. Bachmann has one on each side. I've not seen the real Talyllyn and don't know if that's a change since the late 50s when the books were first published. Bachmann show the coal bunkers open. The books generally don't. Lining is silver on the model, both books are a shade of blue and the red of the model doesn't correspond to either the shade used by Dalby or Kenney. It's somewhere in between. The name on the saddle tank is printed on a red background. Both illustrators seem to have it directly on the tank and Bachmann haven't captured the font of the original.
Edit: on the packaging, apart from the logos, it seems virtually identical to the Hornby Thomas boxes we're familiar with in the uk. Colour seems the same and there's details of the rest of the narrow gauge range on the back. If I was being cynical, I'd suggest the packaging is all made in the same place irrespective of whose products it's used for. There's a stamp on the back of "K151029" which I assume is a factory serial number
For a whimsical purchase, I'm happy with it
David