Walt's experience is that of many people who have been into handguns for awhile. Cheap holsters, and even the ordinary types produced by competent mass manufacturers, often sag, pull away from the body, are too loose around the gun, slip around on the belt, don't feel right if you wear them for long periods, or have inadequate fasteners that dump the gun when you bend over (nothing like wrecking a $75 set of grips or the finish on a $600 gun because you "saved" money with a $30 holster).
But everybody has to learn the same way, by looking in a drawer or box one day and seeing a dozen "inexpensive" holsters that are never used, the total cost of which could have bought a couple of really good ones.
It's hard to find a better holster for a semi than those from HBE, and maybe impossible to find one at his reasonable prices.