Li Shenron said:Unearthed Arcana is the closest version to the PHB Cleric, the only difference being spontaneous casting.
The class uses the Cleric's spells per day table (domain slots are merged with normal slots) with Sorcerer's spells known table (but of course spells known must be chosen from the Cleric spell list). The spontaneous cleric also automatically learns his domain spells.
Everything else is the same as the core Cleric, therefore it is very easy to evaluate this class. Also UA is OGL so you can easily find full information about the class on these boards.
Eh, they also get an extra spell per day per spell level. So, one more spell of each level per day (including domain spells), spells known as a sorcerer plus domain lists.