I've used a suicide hub setup for the last 5 years, with a brake, on my spare/errand bike. I'm a heavy guy and the cog has never spun off. When I had to replace a spoke, I had to heat the cog and lockring to soften the locktite.

Just make sure you use a wire brush, citrus degreaser, rubbing alcohol, red loctite, and a bottom bracket lockring. Rotafix doesn't hurt, also.