I was thinking in terms of supercharging wether the prochargers are the best in terms of reliability or not? Or are there any "better" systems out there?
I believe pro charger quality has improved but you need to look at the total cost of the system. Definitely need a intercooler and the correct base tune and tuner. Then you'll need to have that tune tweaked for your conditions. Edelbrock has a great setup and in my opinion better overall but pricey.
You could do a search here and there are a fair amount of people that bought the pro chargers but most had either belt slippage issues, oil leaking from the unit or tunes that were hard to get straight. You're looking at a fair amount of money - $5-7K plus install time. The WK1 engines are very good but do not tolerate much boost past 6 lbs like other modern engines.