I have a Sirrus Elite (2004).

I admit that the handlebars do currently have some horrible creaking, and I can't yet figure out why. But I'm sure all it needs is a good LBS mechanic who knows what needs to be tightened (or loosened) - I can't think it's a design flaw.

I changed to the carbon seatpost. The shock seatpost sucked, and started squeaking after a little while anyway. I was very unimpressed.

I changed the brake levers to standard Deore LX, as the stock ones felt heavy and cumbersome.

I changed the rear wheel to a good, strong touring wheel (I'm a lardy git).

I love my ride.