As Tarpaulins go this is definitely a good sheet of plastic. Plastic is waterproof so it's good for putting over things that are outside and could get rained on. It can also be used to protect from the sun or wind by installing as a barrier (Note that supports aren't included)
Whilst the colour choice of this tarpaulin is fairly limited in being blue, when used as a sun shelter on a cloudless day this merges with the sky and is hard to spot. This can be a danger to passing birds.
This tarpaulin is lightweight to other tarpaulins I have looked at, so can blow around easily and needs securing if left outside covering something for long periods of time. Due to the lightweight material, the tarpaulin may not be the longet lasting product out there but serves it's purpose well.
Overall if you want to buy a cost effective, practical, easily storeable (it folds up nicely) tarpaulin then this is as good as any and bargain priced.
As the name states, this is a general purpose tarpaulin. It is a medium size which is probably OK for most purposes (I used it to cover my bicycle as I had no shed). It keeps the water out - provided you wrap things properly. Because it is made of lightweight material, it can flap easily so you need to weight it down so it can do its job.
When I first bought it, I realised it was not as heavy as others I'd had (not from B&Q - and more expensive ones) but it was certainly adequate for the job.
Ultimately, this is a tarpaulin for ordinary use. If you want something that will last, you will need to pay more for it and get a heavier weight tarpaulin in a different fabric. I found that after a few years, it seemed to develop a few tears and then it frayed badly in those places and became virtually unusable (unless it were for smaller items).
It's a good buy if you bear in mind that it is lightweight and not meant to last a lifetime.
Just to add - the medium size (which I bought) cost around £11.50 and I felt it was much better value than the smaller one for around £10.