Got a chance to compare the Oregon 80TXL 'Nano' chain (.325, low profile
and narrow kerf, .043 gauge), side-by-side with some 91PXL (3/8, low profile, .050 gauge), and also some 91PS 'PowerSharp' (3/8, low profile, .050 gauge) on identical, Oregon, 15 Amp, corded electric saws, cutting the same wood samples. All are Oregon reduced kickback chains.
These photos show 80TXL (left), with .325 narrow kerf (Type 95VP - not in this test, middle), and the 91PXL (right) for comparison:
I cut well over 100 test 'cookies' in hard, dry, ash, cedar, and maple, as well as some fresh maple and spruce, of different diameters:
Also, tried a little 'noodling':
While I did collect some subjective cut times ('1 Husqvara', '2 Husqvara', . . . ), the interesting thing to me is how similar these performed. As a practical matter, the differences in cut times would not be significant to a casual user. Subjectively, the 'Nano' chain appears to perform slightly better than the 91PXL in smaller diameter wood, as well as softer wood. While the Nano chain did 'noodle', it produced relatively short 'noodles' and cut slower. The PowerSharp chain noodled best, in this test, with the 91PXL coming in a close second.
Differences may be more significant with lower powered (e.g. battery or pole) saws, and maybe some top handled saws used for pruning. Since the Nano chain requires unique sprockets (drive and bar nose), I would not be in a hurry to change over a saw that is satisfactorily running more conventional chain. But I am pretty sure that I would prefer it over 1/4-inch chain on those other saws. 1/4-inch chain always cuts slower for me, and does not Have a lot of cutter material for filing / sharpening. This might be it's best niche.
Philbert