When I did the 'how-to' video for installing this forend, I said I do a review of it after testing it in the field (if you will...) and here it is.
-Cost (I paid $25)
-Ease of installation (see previous video)
-Modularity (accepts rails and all the accessories that accompany them)
-Solid lock up (very little to no play at all)
-Design allows easy manipulation of the action, more so than the OEM forend
-Appearance (just plain looks good on the shotgun)
-Creates wear marks on the barrel/mag tube.
Here's the review video:
Forend Review Video
All in all, I love this forend. It's one of those products that makes you say, "Why didn't anyone make this before?" I just ordered a few more to replace the forend on all of my 870s.