Scram cassette to Ultegra

I have put an 11-32 Scram cassette with a standard Ultegra derailer and it worked a treat without any modifications or ajustments, I can even run the 52 chainring with the 32 but the chain is at it's limit, on the 39 ring it works well. it even seems quieter than the Shimano cassette? Just thought I'd share this in case others were contimpating the same swap for an extra gear up the hills.
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it may seem ok in gear but id be very surprised if there wasnt any catching and chain binding while changing into bottom. its the same if you jump too many teeth in one go, say 12t next to a 17t.
I've been thinking about doing this myself.I have a 39/53 Dura Ace crank and want to get closer to compact gearing so figured a SRAM 11-32 cassette would do the trick.Is this feasible (chain lenght aside) as it's a cheaper otion than anew crank. Oh and yes I know I need to be fitter, lighter and to grit my teeth before I get told but I would appreciate a technical/engineering angle please.
Cheers
Matt