I just receive a set of the Findway floor liners for my 2010 Maz5. I'm happy with them. The fit is pretty good and they look like they'll hold up well. Definitely better than the universal type liners. They have a fuzzy carpeting on the top side, similar to astro-turf. Personally, I'd prefer not to have the carpet where I live (dust, grass burrs, etc), but it's very short pile and looks to be durable. They're easily washable and will dry quick.
I bought the 3D maxspider Kagu mats for our Grand Caravan and those liners are AWESOME (with a Capital A W E S O M E)!!! They don't curl up on the ends like the Weathertechs are prone to (what I have in my Truck) and they stay put in the vehicle due to the velcro-like bottoms. Unfortunately, they're not available for the 1st gen Mazda 5. For those of you with a second gen Mazda 5 (2012+) I HIGHLY recommend considering the 3D maxpider.