I decided to make written reviews for the videos I made earlier. Starting with the Dell AT101W
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This is one of the most common vintage mechanical keyboards out there, there are millions of these. On eBay there is always a host of these available, and you can procure a good one these for as little as £20 or less. As a result, and because of the switches it uses, it is a great first mechanical keyboard and a great way to get into Alps boards if you haven't already. For what they generally cost on eBay, they have one of the better price/quality ratios I've found.
The board itself is a fairly common Bigfoot design, with a pretty strong plastic case and a metal mounting plate and feels fairly weighty. It's quite big in size, so if you're looking for a space saving design or if you have a tiny desk, this might not be ideal for you. The keycaps are laser-engraved standard-thickness ABS with a noticeable groove in the lettering.
The switches it uses, Alps SKCM Black, is a tactile switch, the vast majority of which are found in the AT101W, so much so that the two are almost inherently linked to each other. They are almost completely silent when pressed slowly, but when bottomed out produce a sharp, instantly recognisable TACK-like sound. It's not extremely loud, but for a non-clicky keyboard it's very "present." The keyfeel is related to other Alps switches, but distinct anyway. It has a noticeable tactility which comes and goes rather gradually, leading to a rather rough feel that not everyone likes. Especially compared to other Alps switches, these feel a lot less clean. Nonetheless, this design has its advantages because the gradual rather than sharp tactility makes it feel a little bit like a hybrid tactile\linear switch and of all the Alps switches I've tried I found these are one of the better ones for gaming. The switches are fairly stiff at 70 gf, and require a heavy typing hand, but it's far from hard to get used to these even if you normally type lightly.
All in all these are very reasonable for the price they typically come at. Although I prefer other Alps switches for typing, they're still pretty decent, and these are also pretty decent for gaming. The Dell AT101W has no glaring weaknesses that I can find, being sturdy, cheap, readily available and reliable; all in all, a jack-of-all-trades, really.