personally a lot of the mats, although offering superb protection, are no good for my angling because I can't carry them. They're fine if you can use a barrow, but large carrying handles are a must.
I'm not keen on polyball mats at all.
For me it must be a deep foam fill and made of a material that is not the smooth pvc sort.
Ie: the fish musn't slide easily when on it. Some of the old mats were a nightmare with a fish literally sliding on it's own if mat wasn't perfectly level!
Add some big carry handles I can get over my head and I'm happy!
the nash monster mat ( foam one ) was good... and I've recently seen the new wychwood one that also looks decent.
p.s. smokey
angry could actually lap the aqua northern mat quite easily

needed another mat underneath!