how do you determine the quality of adhesive vinyl?

I suppose it depends on where they're supposed to go.

I wouldn't think you'd want something with a contoured bottom if you were applying it to the floor since the contour would eventually make the floor lumpy.

i can assure you vinyl tiles are rubbish

i like to lay it on thick

I disagree with Boomer, often tiles that have a contoured base are much more likely to sit straight because the depressions leave room for the glue to even out. Where as, with a smooth tile, it's too easy to have the glue glom up on one side or another.

sorry can you explain what a contoured bottom is? I'd just like to know whether the quality is based on the small pockets on the adhesive side, as I assume they have "bubble free" technology.

thanks,

Are they vinyl tiles or sheet vinyl? Are they on rigid backing or not? Are the pockets full of adhesive or do they just create a pattern for the mastic to latch on to? Can you link to the product you're talking about? Is it for a floor or a wall?