5 star all the way. I hated my impact gel, it broke down quickly and hardened up on me (forget about riding with one if you have harsh winter weather!). My already sensitive horse turned into a sour, sore backed horse! Bit the bullet and bought a 5 star and it was love at first ride and my horses back issues soon disappeared. I know have 4. My favorite thickness is the 7/8", its just a good all around thickness. I use it for trail riding, barrels, team penning and sorting. I also have a 1" for roping and a 3/4" for light training, flat work and showing. Yes they are pricey but they last forever and don't harden up like other pads do with time.