I recently went with the Cobb 1+.
Initial impression is that it allows me to pull my driveway in 2nd gear, which is pretty impressive, as it stalled when I tried it the first 2-3 times
Driving it on my way to/from work (a twisty route I'm intimately familiar with)- definitely worth the money. The low to mid range improvement is more than I expected and increases the fun factor.
The Cobb RMM impressions: It made the shifter feel more connected, NVH a bit more overall.
Next week, I'll be installing Pierce Motorsports Street package. I'll report back when I have time to feel it out.