I just got my L1T through last night and compared it to my L1 (with the 2 stage mod) and L2P. I didn't expect the L1T to be a revolutionary improvement over the L1P (eg 150% brighter on the same battery), and so I'm not disappointed
My impressions (all torches running NiMH):
-The L1T on high is maybe 25% brighter than the L1 on high, but not as bright as the stock L2P.
-The L1T on low is much brighter than the L1 on low (I have a 5ohm resistor in there). I really don't think the L1T low mode is low enough to be really useful - it's still too bright for night reading for example. The high/low selector bezel works well though.
-The fit and finish on the L1T is better than the L1 and my L1P (which I gave away). The anodising is definitely nicer than the slightly rough L1P anodising.
- The L1T beam is nice and white, essentially the same tint as my L2P.
Just for kicks I tried swapping my modded L1 tail onto the L1T, to see if I could get a 4 stage fenix. Unfortunately it just functions as an on-off switch with the L1T (ie you can twist it on or off, and the push button switches it on or off instead of changing brightness)!
I think the major improvement to the L1T is the 3W head which can cope with higher voltages. I'm going to pop a lithium AA into it (might try finding a 3.7V AA in Australia) and keep it as a spare, and just keep using the NiMH L1 as my EDC. I really like that little torch.
I'd give it a 4/5 rating, but as I said I think it's because the L1T is evolutionary rather than revolutionary like the L1/L1P. If they had a lower low mode I'd give it 4.5.