I've had a Paasche H for years now although just learned to use it a year ago. Bought a Badger 100G w/ fine tip last month and extremely happy with it. In fact, I'm so happy that I'm thinking about getting rid of the Paasche and buying another 100 (probably LG) w/ medium tip, that way I have one for enamel and one for acrylic.
As for my reason for the 100G instead of LG...I thought the bigger paint retainer may get in the way of my hand and view of the plane. As for need for bigger size, it wasn't necessary as I use a shot glass to mix paint and thinner with a dropper then use the dropper to squirt paint in the airbrush. As the paint in the brush runs low, I just squirt some more from the shot glass. The biggest benefit of the shot glass is that by the time the airbrush empties the first time, you can already see the paint's pigment in the shot glass separate so you have an opportunity to do a quick mix again before refilling and continuing.
With dixieart selling these for $60 a pop, its well worth the investment considering the costs of a good kit nowadays. I'm about 1% away from finishing a 1/32 scale bf109g14, my first with the 100g and completely free hand (no masking). I'll be sure to post some pics here when I'm done.