And I used to think they were great but after several years have come to the conclusion that they do not work for me in that role. The simplest reason is the 5% of the time they have some type of issue, condensation, dirt, lint, wrong brightness setting, and inability to make the practiced presentation (this is the biggest issue) like off hand, one hand, picking up off the ground or a table, awkward angles etc where you can not use the practice repeatable presentation you have drilled. Those small hesitations when you have to correct and thousands of draws in awkward positions finally left me with a cost benefit ratio in favor of a hi vis sight system like the Sig X-rays.
For situations where there will be a static presentation like home defense, ambush, behind cover situations I still use them and think they are a great choice.