You might also find that the roo may be friendly and sweet now, but most roos will be more aggresive during the 'Rut' (early spring), when they adopt a much more territorial behaviour. Right now, we've been having a bit of a freak winter thaw. My patriarch Bow Lake cock, who is normally very sedate and friendly, will beat the tar out of me if I lay a hand on one of his hens. This seems to be a norm with chickens. After a period of cold, the warming temperatures and increases in daylight seem to spark a behavioural change in chickens - getting ready for the breeding cycle. Therefore, Spring is a really bad time to cull off nasty cocks, mainly because most cocks are nasty during that time. If you have a rooster that you are happy with, breed him, but be forewarned you may have second thoughts when the rut rolls around, but most of the time that behaviour is just a passing thing.
Most of the time, Buckeye breeders tend towards hyper, excited chickens. Buckeyes should usually have dark meat over there entire bodies (unlike the average broiler), which is actually thought to be caused directly by the flighty behaviour. They are somewhat bizarre for a big breed -- flighty like a little Hamburg, but as big as an old Australorp.
I have never owned Buckeyes, but I assume since they were grafted from the Brahma and the Rhode Island Red that they lay Brown eggs. You probably already know this, but the best way to observe your flocks laying abilities is Trap Nesting. What you do, is when you build your nest box, drill a hole in the top. Then, make a sliding door (up and down) on the front. This will be propped open most of the time, by a string running up to the ceiling, then back down to end tied to a stick with a notch, catching the hole in the top of a nest box. The hen will go in to the nest box, get settled to lay the egg (meanwhile tripping the stick in the top of the box), and she will be trapped there until you come let her out. This is inarguably the most successful method of monitoring the hens' laying (and you can then breed from the best layers), but it can be impractical - you have to check on them constantly, otherwise you'll have a coop-ful of trapped hens, and a Rooster trying to figure out where his girls went.