Things I liked: For the price, the build quality is pretty good. This bag should last a long time, and stand up to some decent abuse.
Things I would have changed: It could be a smidge longer, but that's not really such a flaw. My air gun may just be a tad on the long side, the width of the rifle may have taken up a bit more side slack than I had anticipated, or there's some slight inconsistency with the final product.
What others should know: The only thing to be aware of with this is that a longer air rifle may be a tight squeeze. My Gamo Silent Cat has plenty of vertical space with the scope mounted, but needs to be nudged into the bag just a bit for it to zip closed. this bag is listed as having a 47.5" interior length, and the Silent Cat is listed as 46". Either the width of the rifle has taken up that much slack, or there's a slight inconsistency with the construction of these bags -- slight. I still recommend this bag as an inexpensive option for any rifle shorter than 46 inches. I'm quite impressed.