If you have long legs and want to slacken your seat angle, or if you live somewhere that has nearly vertical climbs and want to steepen your effective seat tube angle, the Fair Bicycle Drop Best (CHF 109) allows you do to that with a Reverb seatpost. With 27 mm of offset you can change your seat angle by 2º. Or slide it to the rear offset and slam the saddle right back to give your long legs more room. The Drop Best is precision machined in Switzerland and is tested to ISO MTB standards and beyond. Check out more at Fair Bicycle.
Why is this sort of product important? Read Travis’ Dust-Up on seat angle measuring!