I think the Donna's Butterfly is the same as the Terry Butterfly, only in pink. The Terry Butterfly has been discussed on these boards MANY times. Do a search on Terry Butterfly; you're sure to find a lot of discussion.
My opinion is that the Butterfly is a great saddle that I rode for a several years, but it's a bit wide for me in the back. I still use it on the trainer (for shorter rides), though, and it's still comfy! On longer rides I got a bit chafed in back (crease between butt and leg) so am happier with a slightly narrower saddle. It's a very popular saddle and has a lot of loyal fans. A small % of women hate it, though -- hopefully you won't be one of those!
Emily
Emily
2011 Jamis Dakar XC "Toto" - Selle Italia Ldy Gel Flow
2007 Trek Pilot 5.0 WSD "Gloria" - Selle Italia Diva Gel Flow
2004 Bike Friday Petite Pocket Crusoe - Selle Italia Diva Gel Flow