I'd agree about a slightly better compressor, but the one shown is more than adequate for the average modelling use. The trick is not what the compressor can, or can't, do, but what the finger does on the 'brush.
I've been using a similar compressor for almost two years now, without problems, and, although a little more versatility would be welcome, this thing cost a pittance, and still works as well as one which would have cost four or five times as much, with not a lot of advantage to show.
The art is in using what airflow is available, and using it correctly - which comes with practice. Believe me, I've used kit costing x thousand £/$, and had the same result with kit costing peanuts. OK, if it's going to be a long-term, semi-pro or professional investment, get the best you can afford, but remember that most compressors (of this type) were designed for the graphics market, used 12 hours per day, 6 days per week, and are priced accordingly. Add to that the 'Wedding Syndrome', where a niche market trebles retail prices, and that's what you'll find with all tools in modelling!