When I read the title "Brainfit: 10 minutes a day for a sharper mind and memory", I immediately thought that this would be a book like "Train Your Brain". Unfortunately, it's not. The exercises are not really exercises and do not challenge you to get better. In other words, they are not a way to get a sharper memory with time. Tips like "Get an electronic calendar with reminder feature, such as Microsoft Outlook" (page 160) do not sound very inspiring or even sure in the books capability to help you in the long run. Plus, most of the exercises are based on fictitious activities that have little or no relevance to practical life.
I will, though, agree that the book has some interesting techniques on how to group information into blocks or even techniques on how to make information more memorable and easy to remember. But there was no need for a 320 pages book: a mere 10 page brochure would be enough.
If you are looking for ways to exercise your brain and concretely track your progress, buy "Train Your Brain". I've done 1 & 2 and was impressed by it. Not to mention that they are actually fun to work with.