i finally went there and got to try beyond burger yesterday. i agree with you that it's pretty close to a beef burger especially when you add all the condiments and such. i really enjoyed it. although... maybe it's my american-sized belly, but i found it quite small... especially for the price. with "cheese" and "bacon" and small drink, it was almost 15 Euros.
There's another place here called vincent vegan that has them which i'll try next.