If you only use analog pedals (these tend to draw VERY little current) you absolutely do not need more than this. Being fully isolated under €100 bucks is great. To be that under €70 WITH extra selectable voltage on two outputs? I mean, you could spend more money, but why?
As for digital pedals... it depends. Digital pedals ALOT more power than analog ones and at 300mA max current per ouput, loads of pedals will be out of range. Keep in mind you should always leave some current to account for spikes, so if your pedal needs 280mA and you have 300mA available, it will work, but you might be unlucky if your mains craps out on you. The good news is that since the power supply has all isolated outputs, you'll only blow the one pedal.
Silver linings I guess...