For the price of the 930, it can't be beat.
The only issues you should be aware of for 930's is this:
In the original runs, the front sight tower was off by a few degrees. This can be anywhere from 1 to 10, causing major problems when sighting in at different distances. That said, there were only a few examples of this that left the factory and I have not heard any other issues regarding this.
What to look for: turn the shotgun upside down on a flat surface so the rear sight and front site are resting on the surface. There should be no movement. If you can wobble it, the tower is off move on to the next one. This only applies to SPX models or is moot if you are running optics.
Receiver picatinny rail was over-torqued causing some stripping.
You'll have to convince the shop to let remove the rail to see this.
New out of the box 930's have issues cycling the lighter bird shots (like #4 from Walmart) You will get stove pipes or failure to eject.
Solution: Run 1 box of 3" magnum slugs should be sufficient enough to break it in.
The 930 is a fine and reliable fighting shotgun, but is crying out for these two upgrades:
Larger bolt release and a Larger safety.
Other than that, it needs little else (unless you need to satisfy yourself with the tactikool-aid like I do

)
If there was ever a question of reliability in a competitive environment, I always flash this video around:
[youtube]iXF-I3GfwI0[/youtube]
In order from right to left is an M4, another M4 (I believe) Remington 1187, and me anchoring with a 930 SPX and yea, I know I missed a few
I myself was in a quest for an M2 or M4 and I was nearly there but the price of a 930 is just too difficult to resist. I ended up snagging a 930 SPX and buying a case of 12 gauge ammo.
A 930 Tactical is $569 and a 930 Home Security is $499 at Frontier compared to $1300 for a used M2 I saw in the EE.
Another viable choice is the Beretta 1200FP which is nearly identical to the M2 and will fit most of the accessories that fit on the M2 at nearly half the price (about $700-$800 in the EE when one comes up) The reason I don't have a 1200FP is one never came up when I had the money
Hope that helps you somewhat, good luck with your purchase
