I've been wearing TEVA sandals for 5+ years!  At the first sign of Spring -- out come the TEVAS.  Happy Feet!
There is no break in period -- buy them, put 'em on and go!  I hardly ever wear sneakers in the summer.  My TEVAs are just as comfortable (maybe even more comfortable) and much cooler.  I just love my TEVAs.  They are going to take me to Disneyworld and Las Vegas this Summer -- lots of walking in pure COMFORT!  Trust TEVA.