The one piece boomstick is still a two piece, it's just fixed because the parts a glued together. The advantage that dye gave to the glue was that it is perfectly centred...but they now say their screw-in ones are just as good. So with a screw one, you can change the backs, but you cant with a glued one.
Glued one is still plenty good-a-barrel, and you can probably get it cheaper too