An open comb razor is a safety razor...er.. with an open comb. Instead of a solid metal support for the blade, it has one with gaps that look...er.. like an open comb.
Never tried one myself, but perceived wisdom is that generally they are a bit harsher than a normal DE type:
Depending how much you want to spend, I started with a plastic Wilkinson Sword one which cost around 4 quid with 5 blades from the likes of Boots, and was fine. Then Santa upgraded me to an Edwin Jagger DE89 which was 20 quid from Amazon and that was a lot better. Having always had problems holding metal fountain pens, I went for one with an imitation Ebony, (plastic
) handle and it works great.
Again, perceived wisdom is that the blades make a big difference. So far I've tried Wilkinson sword, Derby and the basic Personna ones. Of those I prefer the Wilkinson Sword ones, but there are many more out there that I've yet to try.
Took me about a week or 2 to be able to consistently get a comfortable and nick free shave when I started DE shaving, (couple of months ago,) and am still working on my technique, but getting some seriously smooooth shaves now.
Hop over to http://www.theshavingroom.co.uk
for much better informed people than me.
As many others have said, Overall, it turns a daily chore into a pleasure.