Marshall Echohead EH-1 Delay Effect sweep echo 

mine too! Not too many seem to like it 🤷‍♂️ I haven't seen many who use it

Thank you very much! Personally I think they are still worth it, because of the build quality and the versatility. There are 6 different delay types and all of them sound great, even today. If you're not interested in that filter delay, then I would say just get, for example, a Boss DD7 / DD8 But if (and that's why I got it) you want that filter delay sound like the sweep echo...this is a great alternative to a Line6 DL 4 or Line6 Echopark. They can get quite expensive.