I haven't heard of those books before, so I don't know how good they are. A quick test would be to see if they are using kana and kanji or just roumaji. If its just roumaji I wouldn't expect them to be worth your money.
If you really do want to learn Japanese I woul not recommend putting off buying a textbook. If you use the search function here, or browse through the old threads you will find many on recommendations for textbooks. Genki seems to be recommended quite a lot.