If it helps anyone I just got my Samsung HD870 delivered today and i am only using it over S-video at the moment until I can pickup my new HDMI cable, but so far I am very pleased.
I am using it with my Sanyo Z3 projector so it seems very suited to eventually use with the 720p upscaled output as the projectors native resolution is 1280x720 and it is happy to handle 720p.
My first thought when I took it out of the box was, hmm it looks nice enough but you can see it isn't the most expensive DVD player, but for £52 (£60 next day delivery) I suppose you shouldn't really be expecting it to be. Not poor build quality, on the contrary very impressively sturdy feeling, but just looked largely plastic budget materials on the fascia.
But on the flip side I was thinking thats not too much of a bad sign as hopefully they have spent most of the money on the inside

Oh yea, the blue light around the power button is a bit too bright I think, not awful, but just stood out against the warm glow of my pioneer receiver's bluw power light
Anyway I watched Swordfish on it this afternoon and the only thing that irritated me at all was when, at the beginning the women gets blown up and there are loads ball bearings flying in slow motion, I couldn't really see the shrapnel clearly and I didn't get a proper sense of the zoomed in carnage, but I think that may just be they didn't film it like that as I have only watched it once before ages ago ...

But overall I was very impressed for an S-video output.
I played a few cd's on it too and they sounded great over optical SPDIF.
The remote does the job