It depends ...
Do enough Searches on various firearms forums and you can hear just about anything you want to hear about these holsters.
Want to hear about one where the little rivets broke loose on either the holster body or the paddle, during a shooting class? You can find a couple of examples ...
Want to hear how they've never failed during a very physical shooting class, and have "out performed" more expensive leather & synthetic holsters? You can find examples of that ...
Want to hear how they've been excessively tight ... or excessively loose? You can find them ...
When I wanted a Fobus to fit a SW99, I was told by Fobus that I needed to use the holster originally formed to fit the G30. Now, the slide and frame of a SW99 9/40 is loose within that particular holster body, but the trigger guard does retain the weapon. Not real tight, but the pistol won't fall out if the holster is turned upside down ... as long as you don't shake the holster hard. It can be wiggled a bit within the holster body, but the Fobus rep I discussed this with said that their primary concern when determining the applicability of a particular pistol to a holster was whether the holster's trigger guard recess was snug enough to retain the pistol, not necesarily whether the rest of the holster was an exact fit.
Close enough for government work might be a good way to describe how they fit some pistols not expressly envisioned when the mold was first made. He said that's also why some of the older packages get added stickers listing the "new" pistols the holsters have been discovered to "fit".
Naturally, if you have a specific pistol in mind for which a holster is specifically designed and made ... then you're probably good to go.
The rivets holding everything together may not prove to be as strong as some folks might like ... and may not be as strong as a folded 1-piece synthetic holster, or a stoutly made leather holster with reinforced nylon stitching, double sewn ... but then neither does a Fobus holster cost what many other holsters cost.
Personally, I only use Fobus holsters for range holsters for a couple of pistols, and I find they're affordable, decent holsters for that purpose ... for me. I have one that I wouldn't want to rely on to retain the pistol if I was forced to roll around on the ground, and it's the model recommended for that pistol ... and then I have another one that really requires a "dedicated" effort to draw and present from the holster, and it's also the one recommended for that pistol.
The Fobus paddles, being very thin and pliant injection molded material, are pretty comfortable in the way they conform to your body. More so than a couple of Blade-Tech paddles I have. Both companies' paddles have proven to be both "easy" to shift & remove, or "difficult" for them to shift and be removed ... depending on the clothing and circumstances involved when they're worn. I've had examples from both companies almost become completely dislodged from the waistband of my pants, depending on my activities ... and then I've had examples of each prove to be so difficult to remove that I had to unbuckle my belt and loosen my waistband in order to get them out & off. It all depends ...
I don't use the fobus for dialy carry because it sticks out like a mail box on a post.
More eloquently put than I might've thought to say.
But then again, it depends on how your body is shaped, too, and what clothing you're going to be wearing, doesn't it?
I know some "gun oriented" cops who have tried and discarded Fobus holsters ... and then I know some "non-gun oriented" cops who think they're just fine, but mainly because they're cheap. Of course, that doesn't really mean much of anything, because you could probably go to some other agency and find the demographics regarding preference is exactly the opposite.
They're certainly affordable enough to buy one and try it, and not have invested between $50-$100 only to discover you don't like it, or it doesn't suit your needs.
Like most of us don't already have a box or three of seldom-or-never-used holsters in the closet.
