I've read that Steve Ritchie rated this machine his favorite SRP designed machine, and I can agree with him on that. I've played the most amazing pins from the 1990s, 2000s, and 2010s, and this one clobbers them all as the best actual playing experience.
The play is fast, but at the same time, you have amazing control. A common complaint about the machine is that you can play it with one hand - yet nobody says the game is "easy." The thing is, the flippers are close together, so if you lose a ball down the middle it's your own fault. Likewise, on the left you have a kickback, and on the right you have a magna save. I have mine set to give you both of those at the start, and you can re-light by hitting the KNIGHT targets. Draining on this machine can't be blamed on any kind of lack of control, it simply tests your skills and reflexes.
The dual playfield is excellently laid out. On appearances, I first ignored this machine because it looked the same as the original BK. I find the original BK to have poor flow (on the playfield, the ball is slow, and on the ramps it's too fast), but this machine has speed and flow comparable to ACDC plus a better layout. The pop bumpers are surrounded by rubber bands so you can get some great rebounds back into the bumpers for a good run.
The skill shot is, in my opinion, nonexistant. I don't know if it is just my machine, but even if I manually put the ball at the top of the launch wireform and let it roll down from a dead stop, it still goes past the WIN lanes and goes straight to the flipper. I've gotten close to hitting the N in WIN from the launch by nudging, but I've never made it happen. The only benefit you get from not pulling the plunger all the way is the ball rolls to the flipper a little slower for better control.
The music is not for everyone, but I find it enjoyable. The main theme will be stuck in your head forever. But, my favorite has to be the Double Knights Challenge music. Many pinballs try to use MIDI to represent real music, and it flops for that reason, but this pinball has music made for MIDI, and it sounds awesome. The sound effects are also very catchy. The speech is just awesome - the Black Knight (voiced by SR) laughs at you when you miss the Magna Save and says No Way when you hit Multiball when it's not lit! In attract mode he randomly says "Give me your money."
My main complaint about the machine is its stock speakers have the fidelity of soup cans. There's a lot of distortion and, having played this pinball in a PinMAME before getting the real thing, I knew right away that upgrading the sound would be my first mod.
The lighting is great in this machine. The light show is very well coordinated, with things like the "lightning bolt" effect when a multiball starts. This is one of many pinballs that sequence the lights faster than incandescent bulbs can responds, so I expect when I LED upgrade mine it will take to it very nicely.
The alphanumeric display has excellent animation. I find it to be very well thought out and it impresses me more than some of the weaker DMD animations.
The mirrored backglass is amazing. I'm lucky to have a flawless backglass, and it is a work of art. The cabinet art on BK2K is just OK.
For anyone who was disappointed in BK and passed this machine up, you need to reconsider.