i dont know much about your spider, but i do know a lil about the Smart Parts 8,
1) it is completly water proof so it can get wet and then fullly work, and it will actually fire underwater. (or atleast, so i have heard)
2) its pretty upgradable
3) and it looks pretty sick.
so take that and accountability into your decision making, is your spyder reliable... or would the sp8 be better? etc
hope that helps.
-Frostbite-
i think your thinking of the SP1 with the water proof stuff, but as far as an SP8 is concerned there very accurate guns, issue is there kinda bulky, if u have ever seen starhip troopers they kinda look like those guns, as long as size and weight arent issues, id recommend buying one