pros: fantastic look/performance, million mile warranty, trusted/reputable company.
cons: cost more than most other lowering springs, may be to stiff for daily driving for some, rumored to "blow" stock struts and shocks.
for me it was hard to find any cons with this product. ive heard people complain about how stiff they are. but IMO thats not the case. and the roads in the Portland area can be very rough. i actually like the ride more than stock. for those with wider than stock tires, the amount of "bumps" you feel is about the same with the switch to wider tires.
i absolutely love these springs, well worth the extra money to me.