#1 I personally wouldn't touch Scheppach, they are not the company they used to be. Stick to the well known compressor brands where spares and accessories are easily available.
#2 Upright compressors are generally less reliable than the horizontal type
#3 190 quid for a 24 litre compressor? I bought a 50 litre SIP Airmate for £145.00 from my local motor factors a couple of months ago. SGS also do a 50 litre for the same money.