Not so flimsy that it isn't (usually) outweighed by the advantages of multiple heads, but maybe depends upon what you want it for.
Get one that you can adjust the angle of the head: I usually use mine one notch off straight, to be straight you've got to actually be in the hedge.
||I echo the comment to make sure you try it on - weight and balance are very personal choices.|
not a recommendation as such more of a avoid
the multi head ones tend to be flimsy