I don't remember much about mine, sorry.
Weight is an issue if you're using it all day, every day. But they are pricey and a heavy duty will last longer, probably. They're not something you want to be buying very often

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I've just looked at that site and it rings a bell. Standard alloy are 3.5kg lighter and slightly shorter.
The heavy duty has box section stiles, which I preferred, and is actually cheaper, surprisingly.
I think that would swing it for me, if you could handle the weight.
Not cheap at £300 but if they last you and that's the way you want to go, heavy duty might be safer and better value.
Good luck.