They are a nice, quick and ride-able bike, spend a long time in the saddle and they make sense. They will in initially seem 'floppy' compared to alloy or steel, but they always spring back, and I am sure that my abitlity is not marred by a flexy frame. It does make them very comfy though.
Bonding may be an issue, I had a gear lever boss fall off, but it was repaired by Argos in Bristol.
Also they will do some alarming but harmless things occasionally, wet rims and use of front brkae can cause a 'vertical' flexing as the top and bottom tube flex as the brake judders. Just something I have always ridden around for the last 15 years on mine!
In short do it, the price of these bike vs the pleasure they give is a no brainer! (Just like when they were new!!!)
Somerset, like 'Heartbeat' with newer cars!
Retro MTB: 1992 Cannondale 3.0 Deore XT M730. 1992 Marin Pine Mountain Deore DX M650.
Retro road: 1992 Eddy Merckx Corsa Extra Telekom Shimano 600 STI. 1993 Dyna Tech Ti.
Modern: 2006 Wilier scandium Ultegra 6600. 2014 Wilier GTR Ultegra 6800.