I think Griffiths' E&M book is great. It's very enjoyable and makes a fine book to use before going on to Jackson (although more supplements are often needed to make it through that). I like Griffiths' writing and I liked the problems and examples he gives in this book.

However, I never liked Griffiths' QM book. The writing is OK (it's mostly in the same style as the E&M book, but to me it just seems like he tries too hard). Overall I didn't like his selection of which topics went to examples and which went to problems. I think Cohen-Tannoudji, et al., is the way to go for learning some QM. It's a bit more formal than Griffiths, but I think it makes far more sense and it has tons of good examples in the appendices.

But, to each his own.