Welcome back :)
Funnily enough I just bought my first DC15 off eBay, an Animal one with all tools but it's dead.
I heard they are really good, reliable vacuums and they actually are worth more than a DC07. They have a nice metal soleplate which is something I love, should be interesting to play with! Never used one before
PS The DC07 hose will not fit. The DC15 has a nicer design hose, where the base flips down at different angles like the Miele S7