The benefits are highly individual - not only how well it fits, but how well the aero features match your body shape, air speed and yaw angle.
I tested an Anemoi in the tunnel back-to-back with two other suits. Relative performance:
- ZeroD sleeveless suit (no aero features other than being tight) - baseline
- BioRacer Speedwear Concept sleeved tri-suit (textured fabric along arms and upper back) - no measurable difference
- Huub Anemoi +7% drag
Error margin +/-1.5%.
The Anemoi was a snug fit, but not super tight (too tight is bad because it distorts the fabric and flattens the fabric texture).