AKA: Avairon (mistranslation), Aveiron (Fan), Bakutenryuu/Bakutenryū Aveiron (alternate spellings)
Attack Ring and Blade Base names are unconfirmed (they have no official names), names are selected based on the earliest release using them, Bakutenryu Zeo.
Currently the Attack Ring and BB are illegal under WBO rules, though they do not appear to have been banned by Takara. They were not released by Hasbro. As such, I am hopeful that this ruling will change.
Attack Ring: Zeo Attack Ring
Solid range and well exposed primary contact points in Right Spin deliver a lot of power with only moderate recoil, making it a competitive choice for Smash Attack in this direction.
Overall, an excellent choice for Right Spin Smash Attack
Despite the better angle of various contact points in Left Spin, the primary contact points are less effective in this direction, leaving the Attack Ring lacking the power that makes it so effective in Right.
Overall, while it has some Smash Attack, it is not competitive in this spin direction.
Weight Disk: Ten Heavy
Heaviest legal Weight Disk.
Compact size and weight distribution makes it excellent defensively but not useful for Attack
Excellent for sustaining RPM – helps with defense, grinding, force smash, upper, and also defending against the last three.
Primary choice for Compacts, Traditional Upper Attack, Weight Defense, Circle Survivor Defense, and a competitive choice for Force Smash and Driger V2 combos.
With faster Attack Blade Bases (i.e. Defense Grip Base (Tip Inverted) and SG Grip Change Base Tip setups), Ten Heavy can be used without loss of speed, and its high weight becomes quite useful with Attack Rings such as Square Edge and Hayate Attack Ring, improving their rotational Smash characteristics however the reduction to the flywheel effect otherwise provided by Wide Defense or Ten Wide tends to result in more recoil KOs. It is nonetheless an acceptable option.
Blade Base: Zeo Base
Built in Right SG (Four Layer System style)
Behaviour between SG Flat Base and SG Semi-Flat Base, not quite as controllable as SG Semi-Flat Base but with more aggression, making it a rather nice tip to use.
Large exhaust pipe details extend from the sides, which have some recoil (though they're rarely hit), and cause some scraping issues, though these are very minor due to the angle between the base and the stadium floor.
Overall, it is generally the best of the Hidden Spirit Bases, but still outclassed by the likes of SG Metal Flat Base (Gaia Dragoon V Version) and rubber-tipped attack bases.
With a very effective Attack Ring, a useful Weight Disk and an okay Blade Base, as well as a pretty neat Dragon figure and unique aesthetics (barring Bakutenryu Zeo, of course), Bakutenryu Aveiron is a good buy if found cheap. However, there are alternatives to each of its parts and it tends to be quite rare, so it is not really a must-have.