I too have the book Tarot Spells. I find it helpful for suggestions on what cards to use for a spell, but I also find the book lacking on some points.
She makes it all sound very easy and a cure for everything, and she does not give warnings for doing spells, for example, it would be wise to do a reading on the outcome of a spell because it may work out differently from what you expect. It also does not mention grounding before doing a spell, or other "basics" I learnt through reading books on witchcraft and wicca. I think before doing a spell it would be adviseable to read some more about spell work from other authors (for those who haven't done so already), although I don't really know what would be the best one to read, I got my information from different books that don't concentrate on just spells.
Another minus is the spell she includes for gaining the love of a specific person - and then she tells you should not really do a spell like that !? why is it there then - to boost sales ?
I think the book can be useful, but I would use it with caution.