Could be very useful in a low light situation...especially at home. My wife has a Crimson Trace on her S&W M637 revolver for that reason, and the same gun doubles as her CCW...that Crimson Trace does not add any bulk.
As a training aid, lasers are fantastic for trigger control and grip consistency problems. As to seeing the sights and your tartget, at night, at any distance over 6 feet or so, tritium sights or a laser are about the only way you're going to be able to get hits, short of a shotgun. Try it sometime...with or without flashlight in the crossed wrist mode...you'll be a believer. I'd opine that most defensive shooting is done in low light situations...you be the judge. Rod
Cherish our flag, honor it, defend what it stands for or get the hell out. Our Freedoms are not free, they've been paid for many times over by heros in uniform. Far better men than I, died that we could be FREE.
USAF FAC, 5th Spl Forces, An Loc, lll Corps, RVN, 69-70, Vietnam Vet '69-'73