As i studied electronics, i could not review this product without taking it apart. I voided my warranty doing so. So i suggest you do not do this....
My test started wit measuring the voltage without any pedals on... it was a neat 8.96volts. Close enough in my opinion. So then i hooked up 7 pedals (8th outlet was for my Fluke multi-meter) and turned them all on. i also hooked up a guitar so they were actually working. And the voltage did NOT drop anything. At this point i could have stopped as this proofs to me it is a solid power brick.
But... as i said, i studied electronics and i wanted to know what it looked on the inside. again, don't do this yourself, it will void your warranty!!
I was well surprised. it looks very neat. it has been designed as i learned in school. Neatness increases reliability in my humble opinion. It uses a big transformer block which makes up most of the weight of the powerplant. It is quite heavy for it's size. The 9V and 12V DC are made by 2 transistors. I could not see what kinds they were. i expect something like a 78H09/78H12 (just googled, and yes they are) and that is perfectly fine. (test showed no drop with 7 pedals)
If i had to comment on something......
If with 8 pedals you get to 500ma the voltage might drop a bit, but more important, The voltage regulators will get hot.
And they are not on a heat-sink or on the case so it can cool like that. This might be a nice improvement for the next version. I would not mind to pay a few euro's extra if there was some kind of cooling added by either a heat-sink, or screwing them to the casing. lets be honest, it's 39 euro now, which is dirt cheap for a power-supply.
I would not hesitate to recommend this to anyone. its a good power-supply for a more then fair price.
Nice job Thomann!!