I have seen the infomercials too,a few times.
Sorry, I can't say one way or another whether these knives are good. However, the following is my opinion.
Most people buy sets of knives and use 3 knives at most. A large chef's blade, a paring knife, and something inbetween. The more specialized your cooking, the more specialized your cutlery is going to get. But people whoa ctually do need a variety of knives, like very talented professional chefs, woon't be using Chef Tony's blades.
If your mother really wants good kitchen cutlery, then I'd suggest getting pieces separately, and buying one good quality knife at a time. Check out
www.knifecenter.com and click on their kitchen center button at the top to see the price ranges of their kitchen cutlery. You can get a Victorinox Chef's knife, a paring knife, and a steel probably for $60!
A few years ago (3 I think, maybe 4 actually) I bought my mother a 7" Cold Steel kitchen knife. That knife is a great kitchen knife and needs little maintenance. Twice a year she steels the backs of the serrations- that is it! Lansky makes a little ceramic stick designed for cold steel's serrations too.
I guess my recommendation is that you and your mother check out what you can get for the $$ you have, and not just be dazzled by the infomercial. Practically any knife will saw into a hammer and cut a tomato afterwards in a half hour period. You want to make sure that the knife will stay sharp for much longer, and that you'll still enjoy the knives after too.
Oh, and I want to emphasize a point I made earlier. It would be wise to first ask your mother which knives she uses most in the kitchen. Really, most people only need 3 knives, and can get by with 2. Heck, the Chinese just use a cleaver!
Happy kitchen knife shopping.