This device is purchased at a reasonable price. It's hard at first to reach 5 minutes without stopping even at the easiest level but I can say that the results arrive. After two weeks I saw my abs that are beginning to emerge. There are still a lot of work to do but it's faster than doing a 30 minute session in the gym. The only drawback for me are the foams at the handles that are not thick enough and are pressing the forearms. It is a good investment to get results and save time.