I live in Hawk Green, which is South Marple (roughly halfway to High Lane from the centre of Marple).
I am aware of the Bicycle Smithy (drive past it down the A6 regularly) & Sett Valley but have never acually set foot in either yet.
There’s also Freeride Cycles in Disley. Never been there either.
I do almost all my bike shopping off of the interwebs these days, only use a real live shop for those emergency purchases when I can’t wait 2 or 3 days for delivery.
But if the new place in Marple is half decent I would be more inclined to make use of it seeing as I can be there and back in 10 minutes.