Softkitty I reckon 150 cals sounds about right ...depressingly! It feels like it should be an awful lot more. Great news on the toning 
Welcome Judys!
Tricky one. If it were me I'd stay on L2 for a bit longer, maybe until you can do the harder versions of some of the exercises? But, if you're going mad with boredom, go up to L3 for a bit of light relief! I think a fair few people, me included, think L3 is easier than L2 so you could go up for a bit for a break
L2 is I think by far the hardest level so don't be disheartened!
Re the plank twists, I didn't feel like they were doing anything for ages. You have to really twist and try and push your knee up towards the armpit if that makes sense? You should feel it in the sides of your abs. You could also try doing the twist but on all fours rather than in plank position. I did this for a bit and definitely felt it more in the abs.
Keep going, you're doing great!
L3 Shred for me today, with a mixture of weights. Amazon e-mailed to say that my TURBOFIRE has been dispatched, yay!
Notyummy I love hearing how you're doing with Insanity...I'm a bit hesitant about the dance element in Turbofire but who knows, I may unearth the undiscovered cheerleader in me 
Have a good weekend everyone...