The 2130 holds the arch a little more and seems to feel a little smoother. The Adrenaline feels a little firmer and thus, more solid underfoot. The adidas Supernova Sequence is a great alternative. It hugs the arch like the 2130, but feels a little more flexible under the forefoot. It does seem to have a little more heel. The Inspire feels like a slipper around the foot (the upper) while the foundation feels very stable. One more option is the Saucony ProGrid Guide. It feels very close to the 2130 but is a little lighter and bouncier. The arch is nice and snung, which will fit a medium to higher arch but may bother a lower arch.