Had a Bluebird but sold it right away. Best drum styles imo = TURFCO & Ryan. Hands down. Best hydro = TURFCO, but they cost more. Being the cheapskate that I am, we bought a pair of Ryan IV's not so long ago just before hydro's came out (the new style Ryans you currently see). $1100 each (ebay), but they were from a rental place. We ended up spending about $450 each to replace worn parts. Sprockets were shot, and so were other things. So buyer beware.
Nuther aerator that nobody mentioned is the Ryan tow-behind. We have 2, but.........
Proud subscriber of TURF Magazine. (thanks Ron)