PMM Keymod panels - yay or nay

I use a channel grip, generally, and I'm looking to thin down the grip on my Scar.
The PMM keymod rails seem enticing, to do the task.

The only downside I see is replacing the front barrel attachment screws, with integral detent. But I'm not planning on really switching out barrels a lot.

Is there any reason not to go this route??

Thanks in advance.