Jazzy,
I've had that since 1993. It's got probably 150,000 miles in an equipment trailer, and many more in the trunk of my car, so I'd rate the durability as pretty good!
It's an SKB, and it is better made than some of the budget ones I've seen in music stores lately. SKB also makes something called a Roto-Rack, which is also ABS, but a little stronger and larger. The thing about those is that you can mount a set of rails in the rear, so you could fit your F1-X, SF-2, and amp up front, then mount a rack power strip or wireless unit or whatever in the back.
Since I got the SF-2, I had to ditch my power strip, and just use a 3-outlet extension cord that I zip-tied to the rear rack ears of the amp. Also, I secured the SF-2's wall wart to the cord with electrical tape, and coiled and taped my power cords so everything's neater. When my Series gets here, I'm going to have to retire this case, as it won't have room for the power supply. If so, I'll probably get a 4 space Roto and put the DS-5 in the back. Either that or just get a separate mini-rack for the DS-5 and my power strip.
Hope this helps,
Charles