I'm somewhat embarrassed to admit that I own a laser more expensive than Glatter's (LaserMax), but I bought it back when it was just over $200 (it's at least double that now), but it has also saved me countless hours and grief setting up my truss dob, and I actually like the "target" pattern it projects much better than the grid on the Glatter laser, FWIW. I've not had to center-dot my mirror, and the results are consistently very good. I bought this thing in 2000, have no idea what the battery in it is, but the beam is still super bright 8 years later. ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ