I've got this bad boy and am really happy with it. Pretty much has everything i'd want (except maybe playign loops backwards). I usually use it with a microphone or contact mic for doing drone type stuff or can make cool loops. I also works with guitar or bass. I think it was $250 Australian, being by far the most expensive pedal I own.
I also have the Berhinger Digital Delay pedal. For $50(australian) it does alright. I used it on my bass last gig my band played and it sounded really good amongst all my other pedals,drum machine,feedback loops, distorted delayed vocal drone.
I don't know if I would trust it for something really progressive or structured though.