Just to add to the "review" with a few more thoughts...
Pfiffi is an attractive loco, well-proportioned, about the same overall size as the LGB Rugen 0-8-0; it looks less "chunky" than the Harz 2-6-2 (99-6001), and nicely fills a gap in the HSB loco roster - I believe that prior to the new TL45 release the only G scale models of Pfiffi and Fiffi (the sister locos, 6101 and 6102, the main differences between them being the length of the side tanks and the fact that one has a superheater - I can never recall which) were the very expensive and rare KISS versions.
On the subject of expense, there is no doubt that the TL Pfiffi is not a cheap loco, but it's about on a par with similar LGB models such as the aforementioned Rugen tank; I would say its level of detail and finish are very similar to current LGB standards too - while the boiler does have some moulded-on pipework there is also quite a bit of separately-applied plumbing, plus some very fine handrails which, although plastic, are not made of bendy stuff.... there is enough fine detail that you need to think twice about how to pick the loco up - the safest method I've found is by the cab windows (unlike the Mallet it's a one-piece cab so you don't risk the roof coming loose!) and under the footplate just behind the front bufferbeam.
As I've already mentioned, the Zimo decoder is very nice - it has some great little touches like the lamps taking a second or two to come up to full brightness when you turn them on, rather than just flicking instantly from off to on.
The pulsed smoke unit (which is one thing you won't find on a comparably-priced LGB model) produces a good volume of smoke, and a handy pipette is supplied to fill the unit (3ml is the recommended fill) although you don't actually get any smoke oil, not even a little starter bottle!
Some chunks of real coal are supplied to go in the rather large open bunker on the left hand tank top, but these are really oversized lumps, and of course if you put them in loose you've then got to be careful not to tip the loco up - I'm going to make up a solid block using some of the much better sized "coal" lookalike that Dunelm sell as Vase Filler (see my post about that from some time back).
I will add some more comments to this thread as and when I think of them. Overall I've very happy with the loco!
Jon.