That's really a beautiful plant Alain, with or without flowers. I shy away from hooked spines cacti ever since I dropped a tray of Mammillaria wrightii on the carpet and spent hours trying to free their hooked central spines from the fabric. But, I must admit M. perezdelarosae is nice enough to make me want to try hooked spined mamms again. Great plant, thanks for sharing it with us.
Once I had a Robin get into the greenhouse and get hooked on a Mammilllaria. I was able to release it but got pecked.