It's good. I adopted it instantly after buying it -- I literally bought it, printed it, skimmed through it, and tossed it to the cleric in my group, saying "here's the new cleric". (This is less cruel than it sounds -- I rewrote most of the other classes, but had only gotten a little ways through the cleric -- the player knew changes were coming).
Domains are gone. Spells are divided into spheres. Characters have major (full) access to 3 spheres, and minor (4th level and under) access to two spheres. Each sphere grants a different power. Instead of generic Turn Undead, clerics have "blessings" (same number as the old Turn Undead), and they can use the blessings to activate their sphere powers (one of which is Turn Undead).
So spell selection goes down slightly, but you gain 5 powers instead of Turn Undead and spontaneously healing.
I'll try to post a more thorough review later.
Cheers
Nell.