Not worth it in my opinion, once you've got used to using them they can certainly speed you up but if you decide to go ahead with it you'll likely need to pick up a lightweight bolt stop plate/ZET plate (I've seen them called different things) to keep your bolt stop working reliably. The downside of that being the lightweight replacement may not last as long as the stock one. So yeah, not worth it imo but at least you have the information now.
In terms of 'putting my money where my mouth is' I actually own a BAD lever and a few lightweight plates and am yet to install either, purely on a case of 'if it ain't broke'. And just to get ahead of any messages I may get, no, I don't want to sell them.