Honestly, I loved Bootcamp. Of the multiple purchases I made for study resources, DAT Bootcamp was probably the best investment I made, aside from Chad's videos. Bootcamp is a very accurate representation of the difficulty level of questions you'll encounter as well as their wording. The topics covered match the topics covered on the real deal. It's unfortunate that Ari released the PAT and RC sections two days after I took my DAT, so I cannot comment on their accuracy and quality, but from what I read it's good as well.
I don't think it's super necessary to complete tons and tons of full length practice tests. His questions are timed and as long as you're dealing with timed questions in general, that's good enough practice. Plus you can access the free 2009 ADA practice test if you really want to try sitting down for the full 4 hours and trying it out. IMO, it's not necessary. Just use the bootcamp timed sections.
Also, his explanations are clear and concise. I think you'd be hard pressed to find a negative comment on DAT bootcamp on SDN. Everyone basically seems to be a happy customer. Make sure you check out his tips on the different test sections, some are really helpful!
Best of luck.