Define quick!!
They're not stupid quick, but can certainly hold their own against the motorway-jockies in their Vectras and Mun-dane-o's.
The thing to remember is, a 200bhp remap is less than a monkey away, and then my friend, you will be pretty quick indeed.
Speak to Toph, he is remap guru, and knows just about every tuner personally after some pretty intensive fiddling with his Mk4.