Unless you can get the specs (how thick are the SS layers, and the aluminum layer - and the composition of the aluminum) and understand the the physics of thermal conductivity ... the best way to make a "guess" is by actually comparing one (in person) to something like an All-Clad pan by comparing it's weight and thickness. Trust me .. you can go crazy trying to figure this stuff out since nobody publishes this info. And, even if you were armed with ALL of the information - would you know what it means?
It's hard to find good consumer test reviews online where there was actual testing done .... without paying an annual subscription fee. But, I did find that the Jamie Oliver line of T-Fal got a top of the line 5-star rating from Good Houskeeping.
Personally ... without seeing it ..... I would probably trust it. Jamie isn't that big of a "celebrity" that he can afford to put his name on "crap" cookware. Humm ... he probably wouldn't want to put his reputation on the line even if he was on the top of the celebrity chef heap ...
Hope this helps.
"It ain't what you don't know that gets you in trouble. It's what you know for sure that just ain't so." - Mark Twain