Some of the brands mentioned in the posts make a few models that are somewhat closer to Surefire build quality. Whether they are also close in terms of durability or longevity is a whole different questions. My Fenix TK11 and TK12 (most rugged Fenix lights) don't feel much different than my Surefire 6PX Pro (Surefire "budget" model). The Surefire clicky has somewhat better feedback and I noticed the spring in the tailcap is thicker than the one in the Fenix lights. The Fenix offer 18650 compatibility, pocket clip, customizable UI (TK12 only), and cost roughly 20% less - at least in terms of RRP.
If you compare other Surefire and Fenix lights, the gap can increase: even looking only at the weight, you have to ask yourself why a Surefire weighs twice as much as the Fenix. Unless we want to believe the weight comes from junk electronics or cheap aluminum, then there is a difference in build quality. The price difference increases too though as a Surefire can cost easily up to 4 times more than a Fenix light with a similar form factor.
It all comes down to what are your priorities: you want a bright light, with different modes, compact, lighter at an affordable price then you won't find that in a Surefire. You want a light with a simple UI and extremely rugged with an excellent warranty, don't care about 18650 compatibility, and you can afford to spend a bit more, then don't look elsewhere.