Well. Their main advantage (other than cheap ) is that they list a huge number of fitments. However take that with a grain of salt. On some models that list a large number of fits, they are overly optimistic about what acceptably fits. Sometimes it will be so tight it will take three hands to insert or remove. I've even seen listed fits that would not fit at all. Conversely , I've seen others so loose that the gun just rattled around. The holsters that are designed for a single specific gun fit much better. My fobus for KelTec P11 fits perfectly , and rides perfectly. The one for Ruger P90 fits ok.
My #2 shooting/ hunting partner like the ride of his pqrticular daily carry gun in a Fobus. After about a year of use they spontaniously fall apart. He shrugs and buys another , but in the last half of their life span either a snatch , or just serious bumping into somthing would easily break it .
The Roto- feature adds quite a bit of protrusion. I would recomend on the standard design ( if you used Fobus).
The ride and concealablity varies greatly from individual holster to holster.
My bottom line = For only a cpl $ more , the Uncle Mikes injection paddle is far superior in all respects, and if they make one for you application , they should be your default choice for inexpensive holster.