Never, not once. I’ve disliked every bike I’ve ever demo’d.
Worse still, I haven’t liked any of the bikes I’ve bought from the off, I’ve always had to learn to love them (Bar the Spicy 516 which was a disappointment from the moment it arrived and just got worse).
The best I can hope for is for them to be a lot better than the previous one in the one aspect that annoyed me about the last one. Case in point, my new Tracer 275, had a Cove G-Spot before, which weighed a tonne and bobbed like mad even with a good CTD shock, hated climbing. My Tracer FLIES up hills in comparison – knocking 25%-40% off my times on Strava almost instantly. It’s also much kinder on the body, a lot less fatiguing to ride, I used to finish a ride on my arse just wanting to get home and lay down – now it’s a lot easier.
But I do miss the way it destroyed descents though, the Tracer is very fast, according to Strava I was 10%ish off on the first ride and very close now, but it just doesn’t feel as fun, I’m just not confident enough to really grab a handful and throw it about yet, just needs more saddle time I think.