Affordaboard makes buying effects a relatively inexpensive bit of fun.
My latest dip included this little gem:
£25. Delivered. Bonkers.
I have it set to give me an always on 'thickening' with just a bit of dirt around the edges. It does get fuzzier if you want it to, and has excellent tone controls. There's no loss of bottom end anyway, but it can be enhanced rather nicely.
Pros: looks neat, sounds great, responsive controls, crazy cheap.
Cons: stupid placement of power socket, absolutely blinding led.