I bought TL2 a few months ago and really like it. Looked at the G2 also.
What I liked about TL2....TL2 comes with a 100 lumen lamp standard, while G2 comes with only a 65 lumen (if I remember right), For some extra cash you can buy another lamp assembly with 120 lumen output for the G2. This leaves the cost of a TL2 at less than half of the G2.
Great throw for the TL2, nice and white, a little bit of spill, not bad enough to be a detraction. Beam focus is good although not absolutly perfect.
Was talking to a dealer at a recent sportsman show who sold both SF and Streamlight. Told him I recently bought a TL2 and had a question about bulbs. Asked about differance in bulb life between brands, and he said no differance in his opinion. He did say the streamlight bulb could handle alot more abuse than a SF.
At that point he took a demo TL2 off his table then preceded to absolutly hammer it on the edge of the table repeatidly. Hard enough to startle all of us standing at his booth and get others walking buy to stop and look. After the beating he turned it on, worked perfectly.
G2 definatly feels more solid, looks better, but when you take cost into consideration, I think the TL2 has the winning edge.