I have a G21 and a G30. The G21 was sent in for factory service a long long time ago and was upgraded by glock to the newer ergo grip. It's a fairly older unit, think it was made in the early 90's. I've owned one for 7 years, the other for 5. No FTF's at all.
I got both second hand, and both have performed flawlessly.
Both have aftermarket sights - trijicon's on the 21, 'trudot' on the 30. I upgraded both with the extended slide release, the wider takedown release, and the upgraded mag release. Both guns functioned fine before, was just a personal choice (i've got big fingers and hands)
Only one. The plastic guide-rod on both. The G30 needs a replacement soon - like in 1000 rounds. Last weak link in terms of making it a fairly no-maintenance gun.
Well, two, my G30 doesn't have an accessory rail, but then again, I don't have any accessories.
No Rust. At all. Congratulations to the Tenifer Process and Glock's choice of alloy.
little to no maintenance required.. well.. the occasional drop of oil. clean the barrel every couple-hundred rounds.. if you want.. or not.
I actually store mine in the compost heap over winter, when spring comes.. i dig it up, shake it out, and shoot it. j/k, but they are that reliable.
Detail stripping is a dream as there's only like.. what, 4 moving parts in the whole gun..
Don't shoot out-of-spec reloads, steel-case(early wolf caused problems supposedly, i still don't trust it, i wish i could.. ), or lead bullets (with the factory barrel) - it's not finicky, just I don't recommend shooting anything weird with any gun... P+P+, P++ etc., all bother me in any gun not specifically designed for it, and the Glock is no exception. If you want a gun that will eat just about any thing you throw at it reliably, with a low low chance of KB, get a ruger redhawk in .44mag. Only gun so far I've seen that will eat just about every commonly available and reloaded round in the caliber (S&W and Colt can't say it). Say that about any semi-auto. KB's exist in every manufacturer's lineup.
If you have small hands, look at the 9mm or slimline models.. the full size ones will be a bit too big for you. My favorite 9mm in the glock line is the G34. It's probably the only 9mm I would ever buy, and i detest 9mm.
If you want to shoot specialty ammo, or alternative calibers, get an aftermarket barrel with standard rifling. You can upgrade/downgrade the G21/G30 series to .400 Cor-Bon, .460 Rowland, and one or two others.
Other Handguns I have owned:
Walther PPK/S .380 *traded away*
Ruger 22/45 MkIII w/ bull barrel - *love it*
AP-9 9mm 'thug-gun' sold it. Jammatic POS
Ruger Redhawk .44mag Love it. Needs a sharp edge smoothed on the trigger tho.
Taurus PT-22 Wife's gun Nice little thing,
Several Colt Pythons in .357mag - sold/traded away.
Several 1911's over the years all either sold traded away. Nothing special about them.
If i had to pick a favorite, I love the G30. As/More Accurate than the G21 IMHO, easier to CCW (it's still a thick gun)
I think the grip angle thing is a minor detail that is something that folks that have trained and learned to shoot with other weapons need to learn about or change their shooting stance. If your hands are too small, that's one thing, but saying that a particular grip angle is worse than another is a non-sequitur, and you really should learn to shoot that gun. I personally feel that the grip angle is such as it is on a glock because the frame is a polymer frame, and the grip angle adjusts ever so slightly for the reduction in mass of the frame to translate to better stance when shooting the gun. My redhawk requires an even different grip stance, and even a 1/4" difference in the positioning of the meat of your palm correlates to big differences in accuracy.
Course, I may be talking completely out of my ass. You be the judge. I've only shot... maybe 40k rounds through the glocks, and a combined 200k rounds with my entire collection.
At least I'm not boring..