I was doing a roller session 6 years ago and experienced a front tire blow out. I knew the tire's sidewall was in bad shape (super light track tubular with a little abrasion). Since the tire wasn't up to snuff, I wasn't using it to race, only training at home.
I forgot about the tires condition for a while until about 40 minutes into my routine. As I was spinning (maybe 90-95 RPM) I started to hear and feel a thumping... And knew it must be the tire starting to go. I slowed to about 5mph before it blew. I was about to unclip (Look pedals with slippery cleats) when it happened. I was on the floor in a second. I lay there laughing for a good two minutes. Just a few friction burns from the wood floor.

But yes- I prefer fixed on the rollers.
I never put rollers on my track bike though.