How useful are 4D bottoms for attack types?

Hey guys,

Sorry if this is a noob question or has been previuosly asked, but I've been considering buying a F: D bottom and was wondering how usefulness this part is for an attack combo. Is it worth using this or would it be better to stick to the other tier 1 attack type bottoms and tracks.

p.s. This is a general question rather than for a specific beyblade combo.

Cheers!
"ask a question get an answer" please