Ah, legal loan sharking!!!
I would run away from that letter as fast as possible.
Yes, it MAY make things "easy" for the moment. But in the long run it will bite you.
My personal motto is if you can't pay cash you don't need it!!! Those things that you really do need you budget for and maybe (as a last resort only) put on a no intrest credit card to pay off within the zero intrest time period.
I also say that I do not deal with those companies who go door to door or mail out mass mailings just because they do those. When I NEED something (like a roof or windows for my house) I will contact companies myself. Please do not fall for the high pressure sales tactics.
Noone can "prequalify" you for anything unless they have your SSN... Yes, they can say they prequalify you for that amount of loan... But YOUR credit report is what is going to set your intrest rate... If they see that you don't have the expendable cash they will hike up the intrest rate and make it hurt you even more.
If you don't have the cash right now, don't take out a loan to buy your kids toys that will break in a week or they will loose intrest in 6 months. They will not remember WHAT you got them 10 years from now, they will remember the TIME mommy spent with them and WHAT you did together.