I visited my dealer the other day and picked one up off the shelf to fondle it. It sure is light.
I also picked up a new catalog, and while looking through it later, it occurred to me that the 192T is basically the 170 in a different configuration. They both have the same engine specs and are "Quad Power" models, which I take it to mean they are the same modular engine which splits along the axis of the crank and has open transfers. The crank itself would be a different part number if the one has an outboard clutch and the other an inboard, as seems to be the case. It doesn't stand to much reason for a manufacturer to use very different modular engines in two saws with the same specs.
The 170 (nee 017) is one tough little saw (a buddy has been very hard on one for several years now and it has not succumbed yet), but they are certainly no powerhouses, for sure.
The price on the 192T is attractive enough to say the least. And the weight is attractive. But I don't think it would be money ahead in the long run to use it as a sole replacement for the 200T if you routinely use the saw up to full-bar-cutting potential on takedowns.
Glen