My first serious Compressor was the TruckAir275 that I bought in 2003 and I still have it to this day still in it's Box, Then about 8 months ago I bought a generic Twin cylinder compressor and within a couple of week I broke the hose clip, I was having trouble locating a new hose for it so I bought The ARB High Output CKMP12 Compressor in the Tool Box, and then the new hose turned up for the Twin Pot model, And then I decided I wanted to buy the ARB Twin Motor Portable Compressor and it is the best there is on the market bar none, I also got the Blue Tyre Inflator Gauge free with it, I also got the same Gauge free with the ARB Single High Output Unit,
Out of all the Compressors/Unit's I would have to say that the ARB Single High Output is the Nicest, lightest user friendly Compressor on the market when used in conjunction with the Blue analog Gauge It all just works and is very Accurate and a pleasure to manoeuvre around a vehicle, The Hoes system just works so well makes this system/package the best to use on the market bar none, Not yet had a chance to try out the Big ARB Twin until I return home I can't say what it is like to operate but it will be very fast, But if a person has Tyres of around 35" mark then I would say buy the ARB single just because it is such a pleasure to use, It took a 245/70/16 from 15 to 32 psi in 1 minute 03 seconds which is equal to a 29.6/30" tyre but it will handle tyres up to the 37" mark without over taxing the Duty Cycle. The ARB High Output has over 12x the output of the older TruckAir275 which at one time use to be the go to compressor in the 4WD world and they were standard equipment of every proud 4WD Owner. They are still Tough and have a very long Duty Cycle but they just don't have the output of even some of the cheapest units on the market
If I had to do it all over again then I would buy the ARB Portable CKMP12 first because it is light enough and easy to move from car to car/Truck and it is just a pleasure to use And the/or the CKMTP12/Twin and the Accessory Gauges are a must have Item.
hope that helps.