[El-Brento]

Researching my next handgun purchase and I stumbled across a couple of companies that sell laser training kits. Laserlyte seems to be available from Amazon.ca, I'm not sure about the availability of Lasera Ammo.
Has anyone tried these? Are they effective and worthwhile or is the money better spent on ammo or new guns? The idea of being able to practise my form and shooting at home is mighty tempting...