Never bought/owned a bike that I didn't like but I test rode a few when I worked at a Lakes bike shop.
Undoubtedly the best was the Cove G-Spot, the absolute worst was an Orange 5.
Hated it's single pivot suspension and the brake jack - can't look at an Orange now without remembering that horrendous ride round the Borrowdale Bash route on that heavy piece of shit.
Also test rode a Cannondale 1FG which succeeded in putting me off the idea of SS on MTB for life. Strange cos I really like SS on the road.