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but a stack of £0,05 aluminium spacers must have an effect on ride quality.
It's not so much the type of spacers, but the amount of exposed steerer, unfortunately I cannot comment on how much it cause an effect on ride quality.
I enquired with Cannondale about fitting a steerer extension on their Cannondale Synapse alu a while ago with an alu steerer as a customer want his handlebar even higher, they actually don't recommend this at all.
I will have to look into this, I know a lots of manufacturers actually says it would be dangerous to have too much steerer on their bicycle.
I have always wondered about that. I'm not saying a load of spacers is always bad, but a stack of £0,05 aluminium spacers must have an effect on ride quality. There is a reason why the headset bearings aren't in the middle of your headtube..