I bought a load of tiles several years ago. I can't be 100% sure that it was these people but the warehouse looks familiar. I got a substantial discount for collection as they are pretty heavy and consume quite a volume in quantity.
The ones I bought were not solid. They are about 10mm thick, the top third or so being solid and the bottom two thirds being an open frame work which dissipates weight. Some of the eBay ones have an inconsistent colour - often with flecks of different colours embedded into the surface unless you buy non recycled ones. These were a pretty even colour all over and looked good.
I wanted the ones with some grip, ideally ones with a circle pattern on the top. They had run out when I went there so I went with ones which have a ribbed pattern in a diamond like pattern. These are great for grip but very hard on the knees if you bend down and quite difficult to manoeuvre heavy machinery over the top of.
I originally floored a double garage and a large shed with them. Very easy to install and easy to cut with a bandsaw - hard to cut by hand though. We moved house back in May and I took them all with me and relayed them in my large workshop. I used a few left overs in the garage. I think, in the seven or so years that I have had them, I've broken one (sharp object dropped at the wrong angle). When I moved and reused them they were so easy to re-lay , almost like new. A picture of them, in the new workshop is enclosed.
So, yes, the flooring type is a good idea, just avoid the ribbed profile ones!
