I wish Crimson Trace would make a set of laser grips with the laser on the left side for us left handers. When using the two-handed grip taught by most instructors (including myself), a left handed person's thumbs tend to block the laser rendering it ineffective. From the looks of the LG-619 in the photo, it appears to stick out a bit far on the right side of the handgun and would tend to interfere with holstering the gun in either of my IWB holsters.
This becomes very disconcerting when trying to pick up the target in a hurry. The only two options I have are a rail mounted laser on the G19 which is bulky, requires a special holster, and requires a conscious effort to turn it on which sort of negates it's usefulness and one of the very expensive guide rod replacement lasers which also is somewhat difficult to turn on in a SHTF situation.
Maybe someday CT will decide to help out us lefties.