roller mat

Just as the title says, Trying to figure out if the filter rollers are worth it. Think Clarisea, Thieling roller mat, Klir etc. From my research it sounds like about $200-$300 on the high end a year in replacement filters, plus the initial cost of the unit. For those of you that have one, would...

I'll be interested in your thoughts as time goes on. What are some other initial impressions? What do you think of the out of the box build quality? Does it feel solid or flimsy?