I flashed Cobb Stage 1 a few weeks ago in anticipation of a protune.
To make a long story short, Cobb stage 1 gave a lot of torque, did not sound as good, did not feel as good in the 1st 3 gears, it just felt like it wanted to rip away but not in a good way, the gears did not last as long in a bad way. Datalogs were safe according to my tuner, but it threw a CEL due to overboosting under load when hot and A/C on in a high gear trying to pass. Overall meh. Even with the CEL, I'd say the tune was "safe", but it's not safe to go into limp mode while trying to pass! Throttle response meh, sometimes better than stock, other times not, harder to heel/toe downshift or drive smoothly at low speed. Power pretty good, but without suspension mods even Cobb Stage 1 feels a bit too much for the otherwise stock setup. Enjoyable, probably overall better than stock, but hardly worth the ~479 bucks. Overall rating is decent but not great if you've never been protuned, after protune I'd say Cobb OTS is very meh because...
Protune... wow. The difference from 93 octane OTS (stock airbox) to protune was the same as stock to Cobb stage 1 OTS 93. MAssive increase in power, now boosting 20psi but tapers to 18.5. Under 3,000 rpm a little less total power, way better throttle response. Massive gains are present, I mean the car just charges very, very hard. Tuner told me w/ a very safe tune he can push it to 90% of what a well protuned stage 2 (but downpipe only, no pump, no headers, no TGV delete) setup will do.
Amazing throttle response, even better than stock for heel/toeing (he's been working on it for years and has charts on how to do it). Easy to drive smooth in traffic even on S#, but the power is breathtaking. It sounds very, very mean, it growls.
What did I post elsewhere? They say Cobb stage 1 is smooth like buttah. Protune stage 1 is like drinking heavy cream boosted with brandy while you're running with the bulls of Pamplona.