Anything is better than a thin felt mat that will never support a record correctly. Really.
But £ 100 is rip-off of course.
Over the years I have bought and tried many different mats including Ringmat, House of Linn, Vertere and Achromat. I have always ended up back with the Linn mat because the music just seems to flow better and be more cohesive. The other mats seem to emphasise certain frequencies at the expense of others and can initially seem to offer more detail but it's an illusion.
I still keep the other mats, except the Achromat which I returned, and occasionally bring them out if I have made a major change such as the Karousel. They are still in the cupboard and the Linn mat remains on the deck.
Not sure what you mean by "a thin felt mat that will never support a record correctly". My experience is the reverse is the case