I was offered 199/mo with 2400 due at signing. Is this a decent offer or should I ask for a lower down payment or upgrade to an EX /w sensing?
Is that the national/local advertised offer? Those usually do come with a significant CCR, which you should avoid. This is really a $265/mo lease if you spread that $2,400 over 36 months. You should be able to lower or (best case) eliminate that cap cost reduction.
I believe the offer for this trim was 220 with 2400.