Broken up into the feats, base class, prestige classes and magic items sections, I have to say the weakest is the magic items. But all of it is very spiffy for those who like transmutation magic.
The base class changes the caster as well as whatever transumation spells he casts. The fury PrC is a mixture of transmuter and barbarian (and requires levels of barbarian and arcane caster). The morph mage PrC allows the caster to effectively wildshape into almost any creature type in exchange for spells. Even though it tramples the toes of the druid, I think the morph mage is the best part of this product.
The feats and magic items are typical. The former has a couple devoted to alchemy, a couple relating to components and a couple oods and ends. The latter, which includes alchemical items, are few and not that creative. They are useful, but kind of obvious when looking at the transmuter.
It easily earns its 5 stars.<br><br><b>QUALITY</b>: Excellent<br><br><b>VALUE</b>: Very Satisfied<br>
[5 of 5 Stars!]