I have one that came in last week, a mega marine with wood. I don't have a tin of pellets shot yet so I really can't say much to your questions.
It does not leak, I find the cocking smooth firm, no wiggle...and it is shooting out to 60 yards ok with a flyer in here and there, I hope it will calm down after I get a few hundred rounds down it.
Some reviews I read said be ready for stock work if you get a wood rifle, mine is fine, fit and finish to the action is very nice, stock is smooth no rough edges...I was ready to refinish but decided against it, It is really too nice to mess with.