I bought my tiny Kahr P380 with XS Big Dot and I don't really like them.
1) The system is dot-the-I, which doesn't provide as much accuracy as 3-dot. At least with such a large front sight.
2) In a low-light situation (Hello...we're talking about tritium sights here) you cannot see the rear sight since it has no tritium, itself.
I just haven't gotten around to switching them out, though, since this little 380 is just a close-quarters pistol anyway.
.45acp, .40 S&W, 9mm, .38 Spl, .380 acp, 22lr
12 gauge, .223/5.56x45mm, 30-30 Winchester
2 Chron. 7:14 Christians must seek His face