Not sure what you call long waiting times, but for GRSmotorsport i think its usually 4-5weeks from when you place the order...
Also worth remembering they are fitted on the fastest RS Turbo (Christian & Beccy's @ 168mph) and also on Tony Turbo's car which has cracked 162mph.
Thats how i'd look at it

and thats not to say that the pro alloy is not a good product either..... but well established and proven products are what we're after!