SOA fan, so beware of bias...hehehe
SOA = ~5-6" lift using stock springs. Benefits include added suspension travel because of where the axle forces the articulation, added clearance under the axles since there are no springs in the way. Issues can include increased rear axle/pinion wrap (and breakage) so a anti-wrap bar is a near-mus. Also, issues with additional sway on and offroad....never was a sports car, definitely not with SOA. Also, SOA done properly will double the price of a normal 4" lift kit. No springs to buy, but you still need shocks, steering issues, brake lines, "should" cut/rotate the front axle, and the fab work to properly weld and create the mount changes and traction bar.
If you are yourself a good fabricator, price is in the $1k range....hire it out and it can quickly top $2k.