This post summarizes my results, but sort of rambles at the end, you are warned. Did my last fit test today and final measurements. Started on 5/16 at 150.4 lbs and 34" waist (5'7"), ended today 7/16 at 143.4 lb and 31" waist. I look a lot stronger and pretty fit, would estimated around 10% body fat or so. I accomplished what I had hoped for with the program (more thoughts below). Last fit test blew the rest away!
Fit Test #1 #2: #3 #4 #5
Switch kicks: 139 135 137 148 157 (+18)
Power jacks: 51 59 59 55 60 (+9)
Power knees: 75 93 84 102 108 (+33)
Power jumps: 54 68 72 80 100 (+46)
Globe jumps: 9 rotations, 12 14 13.5 14 (+5)
Suicide jumps: 23 24 24 26 27 (+4)
Push-up jacks: 29 29 34 38 41 (+11)
Low plank oblique: 78 89 85 110 115 (+37)
I switched to eating Primal about half way through, though wasn't super tight with it the last couple weeks esp. with beers and such over the holiday. I supplemented the Insanity with mostly easy runs 3-4 times per week (4-6 miles in length, the occasional 8-13 mile one to stay ready for longer running races), did a 100 mile easy bike ride in there, a 10k running race and a half marathon trail run. These took the place of the Saturday Insanity workouts, otherwise I did nearly all the workouts but typically chose to sleep in and actually recover instead of doing the "recovery" workouts. I also was lifting or doing the primal body weight exercises (pushup, pullup, military presses) about 1-2 times per week (probably averaged 1.5x/week over the Insanity period) which I think contributed a lot to my pushup numbers and overall physique improvement.
By the end I thought it was getting a little old as they only rotated 3 workouts in per month. I actually give the program a lot of credit for motivation though. Before starting this program, I wasn't in a great place mentally or physically. I ran frequently without purpose, I was a little bitter about things in my life and probably drank too much as well. I finally had enough and made a large effort to improve myself mentally and physically and this program motivated me to get out of bed early and put in the effort which was a big difference than my normal morning (and evening) routine. My mental outlook has improved drastically, and subsequently has carried over into other areas of my life including my marriage. I want to credit Athol Kay's site for some of that as well (see Sex as Weapon thread if you've been under a rock).
I'm still not sure what's next though. At one point I thought Asylum, but I think I've had enough of the HIIT for now. Would still like to get stronger and improve body comp even more so probably shifting more towards lifting (have a bench and weights/pullup bar at home), maybe CrossFit which my wife does, possibly P90X. Good luck to those looking to improve, this program is hard but I enjoyed it