I'd agree with all the above, except perhaps with your views on the Desert Eagle trigger. By way of contrast I felt it to be graunchy and physically uncomfortable to shoot, even in SA. Its general construction is quite different from the rest. If it had been in the same vein as the 92FS, CP88 et al, it could really have been a contender, rather than a slightly obscure also-ran.
Still bloody good fun though

The Umarex S+W's trigger is much improved after a basic fettle and decent lubrication throughout. But it does have the flaws you describe. Interesting to know how it compares to the 'real' version too.

One thing doesn't get mentioned enough: Long term, it's well worth picking up a spare indexing pawl or two. Same goes for all the Umarexes that use the smaller 8 shot mag too. The indexing pawls and the magazines (less so with the S+W mags) are made of fairly soft alloy and see a lot of action. If the mag jams and the trigger is pulled too hard, it can ruin both components in short order.