I have out of position SV on 2 players. I think it is reasonably valuable, but the issue is that you won't ever get it above 5. You have to believe in it to actually use it because while it is an SA that you normally can't get, you are also going to have to spend more points in Shed Block than a guy who gets that AEQ.
The +2 agility is a good modifier however. The 2 pieces I have are a DLineman who got +3 agility, +1 SV and a LB who got +1 SV, +2% break block chance.