MMmm Eternal Twinkler has a Roo as well, so he'd know about those too.
I think the ride is all personal taste.
Pros can ride them for 140 miles at a time, so it's obviously not impossible.
I usually ride Steel, and lately with carbon forks and that's fine.
My TT bike is a Giant TCR - so that's aluminium, but again with the carbon fork, and I've ridden that for 100mile TT's with no worries.
My mate has a custom built fully aluminium Dave Lloyd though, and I rode that for a bit and hated it. But he finished a 12hour in good shape on it.
A test ride is essential really. What size tyres did you say you were getting ? I find 23mm to be the best for road bikes - more grip and comfort.