Vevor 8840 magnetic annular cutter/drill review

The drill I reviewed in this video 810 rpm with 11 annular cutters and drill chuck $249.99 https://s.vevor.com/bfQimb Same drill, but without the chuck, and without the cutters. 810 rpm $159.99 https://s.vevor.com/bfQik8 Similar drill, with chuck and 2 larger cutters, variable speed up to 700 rpm $259.99 https://s.vevor.com/bfQiln Similar drill, with chuck and no cutters. Variable speed up to 500 rpm $198.99 https://s.vevor.com/bfQilz Similar drill, variable speed up to 580 rpm, chuck? Bit? $258.99 https://s.vevor.com/bfQilE 11 piece Annular cutter set, 7/16” to 1-1/16” $161.99 https://s.vevor.com/bfQilP 6 piece Larger sizes Annular cutter set, 1” to 2” $161.99 https://s.vevor.com/bfQilZ Video chapters 0:00 Video start 1:11 Unboxing 4:05 Examining the machine 5:41 On safety interlocks 6:51 Testing runout 9:30 Portable drills and precision 10:38 Inspecting cutters 18:51 The drill chuck 20:32 Coolant reservoir 23:07 Center attachment 25:03 Slide lock (lack thereof) 26:23 Testing radial cutter on structural steel 33:34 Testing radial cutter on hardened 4140 37:23 Testing smaller cutter on hardened 4140 41:27 What is tool steel? 44:05 Attaching drill chuck 47:28 Bit sharpening 49:38 Drilling and tapping 57:02 Challenge to viewers 58:10 Drilling a 7/8" hole 1:01:39 Magic smoke 1:05:05 Final thoughts 1:07:10 Drilling upside-down 1:14:13 Final thoughts on wiring in your own variable speed