About SAP-Press Books

Can you give me an opinion of the following books of SAP-Press?

I would like to buy them.

The Official ABAP Reference

$149.95 - Now shipping!

SAP Smart Forms

$59.95 - Temporarily out of stock - shipping resumes the week of November 21st, 2005.

Enhancing the Quality of ABAP Development

$69.95 - Now shipping!

mySAP HR: Technical Principles and Programming (2nd Edition)

$69.95 - Now shipping!