Laserlyte V3, Lasermax Uni-Max Micro, or ?

[cogito]

Hi,

I have a cheap $25 laser for one of my pistols. It needs constant realignment and so am looking for one that once zeroed, will stay that way.

Does anyone have experience with the Laserlyte V3 or Lasermax Micro?
Or is there another very small laser that you would recommend (<$150)?

Note: this is basically for fun, just to give me some variety when I'm at the range.

Thanks.