These are the only discs with full support that I've ever found for the Xbox 360. Every other DL I've tried is hit or miss. I've never ended up with coasters after more than 250+ discs burned.
Weaknesses:
Tad pricey, but that's the cost of quality.
Summary:
Not recommended for everyday backups, use regular DVD-Rs instead, but for Xbox 360 games, they are unrivaled.