I bought one of these a while back just to see what they were like
Eden Quality Combi Waterstone grain 2000 / 5000 | knivesandtools.co.uk I wanted to compare it to the naniwa stones. The one you posted looks remarkably similar.
To put it bluntly they are junk and a complete waste of money, they may appear cheep but not when you realise you will have to stick it in a draw and buy a decent stone. I bought mine to try on knives, no way I would even contemplate letting a razor touch one !! If you want reasons here they are :)
1) They are soft, I mean really really soft. I have bought lots of stones and these things are the softest I have ever come across by a long long way. I tried sharpening a knife and had to lap the thing 3 times due to the very visable dishing. (I only used it once)
2) The stated grit size doesn't feel anything like what it should.
3) Due to how soft they are they won't last long and require constant lapping.
The decision is of cause up to you but I would spend more and get a decent stone that does the job. In all honesty I have not come across a "cheep" stone that was worth the money and these things are the worst I've ever seen. I have never understood why people are happy to spend hundreds on knives/razors then buy cheep nasty stones to maintain them!
Sorry if it sounds harsh but I'm trying to save you money. Buy a decent stone or stones from the get go because if you go down the cheep and nasty road you will realise you wasted your money and have to buy a good stone anyway :)
My experience is really with knives but I highly recommend the naniwa super stones. They are the. best price to performance stones I have ever used.