Seems like a fair price for an SP-01 Tactical (the "tactical" model has the decocker and pic rail).
It's had a bit of work done to it... custom cerakote color, that appears to be a dawson precision front sight, aftermarket G10 grips of some sort. Factor the extra mags ~20/ea in value.
People mess with the internals on these things w/ springs and stuff but it'd be hard to say without getting up in there. If you pop off a grip panel and see a colored hammer spring in there, it may have a spring kit of some sort from CZC or CGW in there, or a colored recoil spring is another clue; or you can test the DA trigger weight to see... if it's 8lbs+ it's factory, if it's 6lbs or less it's got some updated springs in there. It doesn't appear to have been shot very much, probably a safe queen.
These are going for $600 new online right now (amazing price btw). No tax but you'd pay shipping and transfer fees so likely $650-660 out the door.
Assuming nothing's been done to it under the hood, "good deal" probably depends most on whether you dig the cerakote color. Might look sexier with some black grips on there.
I'll 2nd what Canuck said. Decent price. Like he said can't tell much from outside only that it's a stock hammer and stock trigger. Usually those get switched out with internals mentioned above in kits. Seems like it has a +2 mag extension.