Lidl have the Parkside 20v cordless handheld air compressors with a digital readout, and selection of valve adapters in every now and then, for relatively little money. If you already have the 20v batteries and charger, then it makes them even more attractive.
Best bit is the three year warranty. Incidentally, I have used this warranty on a 240v planer which I have had for approx. 2 years 9 months, which developed a fault, and they paid for UPS to collect it and to deliver it to Germany, and less than a week later a new sealed replacement was delivered to my door. They didn't want the receipt (although I had it), just confirmation of the serial no. on the tool presumably to confirm date of manufacture.
Slightly off topic, but one of the best tools from Lidl was their Parkside 20v cordless impact driver (sub £20). Its had plenty of hard use over the years, and is still going strong, and at the moment is still under the 3 year warranty. A fantastic tool if you are into woodworking.
I am certainly an advocate of good quality tools, as they reward you with longevity of service - I still use the Dewalt 18V cordless XRP range of tools which I have had for years, but the odd certain hand tools from Parkside don't go amiss.....