Hi Paul,
I'll have to disagree with Ricky

on the simple front as I think it is a very simple rig, very few knots and links and bits attached.
That said - if the weights (which I have not seen) are expensive, then that is another issue, but weights these days are blooming expensive anyway

.
At first I thought the weight would be difficult to change, but one knot and you're back in business. There are options to tie a PVA bag easily up the line from the hook (if that's what you feel you need to do). Very quick to set up again if you do get smashed

.
You said that you are having reasonable success with the rig, dos that mean you are asking for improvements? If so then as Ricky has said try using a running feeder rig and see if there is any difference in your catch rate. Try using a back lead, the list of things to try is endless. But keep it simple is the key, and ring the changes as you try something new.
It's all down to how the fish will take it. Tight lines.