As far as the cutoff, ECE spec vs the DOT spec, Im beginning to think for where I live that the ECE cutoff might work out for me, the reason being that I live up in the poconos of pa, I have alot of Narrow,twisty mountain roads,
My current projectors have a dot step cutoff, and when you hit those blind switchbacks that dip down then up hill, you loose just about ALL Lighting because of the sharp cutoff, its like you just shut your lights off.
The ECE Cutoff has a bit more light on the right up higher, this means that for me,
I have alot more light on the right side of the road, something I need because there is a huge overpopulation of deer up here.
The only downside with the ECE cutoff is that you could potentially blind drivers on 2 lane streets if you are in the left lane and they are on your rightside front corner.
They come shipped complete, just need to buy ballasts, for Projectors that seal like factory, use factory aiming, no need to cut your lights apart, and are comparable to alot of OEM projectors.
Heres a few more pictures of the G1 Projectors compared to the G3's

G1's in my black housing lights, with reflectors that have had the holes filled and the facets smoothed out. the G1's look great, they are very clean looking, but the G3's throw alot more light and alot farther.

The only real concern I have is the total length of the G3's in our lights, I have to take another look at my lights and see if I have another 3/4" of room. I dont want to get too close to the lenses.

G3's in a civic.

G3 Guts.
More cutoff pics, showing the stock ECE cutoff at distance, low beam and highs.
Closer view
I just think these kits are great for the price vs performance ratio they provide. and that our stock lights are dangerously crappy.