Ok, it's a fairly limited effect by today's standards, BUT, it does what it does BRILLIANTLY!!!
Build quality, well it's built like a tank and weighs about the same too, which is never a bad thing.
The battery compartment is rather fiddly though and could have been designed MUCH better, that's about the only gripe i have with it.
If you want wooshy and trippy, then you're not going to go wrong with this.
Sounds fantastic on synths too, which is the main reason i got one, i'm pretty sure the early Numan stuff used one of these in various places too.
Great for FUNKY clav, Rhodes etc too.
Not for use on everything, but when you do use it it'll bring a huge smile to your face!