i'd say if they are smooth bore then it might very well be worth it............
but if they are rifled bore, then i'd pass...........
the smooth bore will work fine for bird shot, buck shot, and inexpensive foster slugs.
but the rifled bore will lead up and do poor patterns on buckshot and also will probably lead up and do poorly on the foster slugs---which leaves only the high dollar sabot slugs for shootin'........
big 5 sports have been runnin the remington express riot for around 310 and they have also been runnin the mossberg 2 barrel set (28" bird barrel with a 18" riot barrel) for $250.
The h&R pardner pump riot at academy is runnin $180 new and the talk has been good on that one as well as it is an 870 clone.
Norinco has another 870 clone in full battle dress and the reports on it have been favorable as well. $200
even though they are from "china" the reviews have been excellent and thru davidson's, there is a lifetime warranty