I just put one on my 870 along with a;
BR-IA-SDM-410330 Burris FastFire Sight Mount - Picatinny Protector.
This really protects the Burris from jarring. Actually it's a very nice clean setup and the red dot is great for fast aiming. I think it's better than a laser because know one but you sees the red dot.
It comes with a nice cover and an on-off switch.
I've seen others on this forum saying they wouldn't trust this sight and I say it works great for personal use. Obviously it's not a combat scope but it's a helluva lot cheaper and like many wannabes here I'm not going into combat any time soon!