well - I've bought my new shoes! and I now know the answer to my question (shoes were ace bet getting blow outs in last pair on sides, 12wks old)
My last pair of shoes with the blow outs were Asics Gel-Netburner (blue and white) - great shoe, but wore through so quickly I can't use them for step or pump - they are garden ready after 12wks.
The pair I bought before didnt' blow out on sides and moved through the ranks as usual (attack to step to pump - still going strong for pump).... I didnt' realise the difference, these were 'Asics Gel-Netburner Professionals' that one extra word at the end I must have missed!!! (so did the shop assistant at Rebel Sport)
Going into Rebel yesterday I let them know my concern on the quick blow out - and she said the side support in the 'professional' reduces the blow out.
so there you have it! (if you were wondering ;op)
wore them today for step - soooooooo nice to put on new shoes isn't it!!!!!
happy stepping :o)