The SMC are actually way better then SPC.I run the 5200 24c and they do great.They actually are 2 mph faster then my SPC8000's,which are comparable to MA,and the punch is noticeable,In my Erevo,MMM ,Medusa2000 .On the ones I have you must exit the wires through the vent.But they can be had at Stormer hobbies for 75 bucks each.IMO they are a good pack,for a good price..