both mate. Sound Quality is better and so is the build. I found the cross fader on the 175 broke very easy and your looking at one of the faders going wrong once a year. I had a 175 for 3 years before moving on to an Allan & Heath. The 175 is a good mixer, but for the extra money you REALLY do get a better mixer overall with the 275. The 180 was just a more modern version of the 175 (hardly any difference to my knowledge). You will notice the difference between the 175 and 275. The 275 will last longer, give you less problems, be more robust and will sound much better.Originally Posted by icb