I went for the 10 degree spots, although I did toy with getting the 15/45 elliptical ones. A bit concerned that the beam might be too narrow with the spots, but it's a really nice spread of light and nicely fills in the void left by the standard main beam and I'm glad I got the spots in the end. They are very bright and give a nice crisp white light, sharper than 55W halogens and the beam goes further than the bike's main. I'm hoping to take some pictures from the saddle for comparisson in the next couple of days...