Hid kit owners advise please for 2010 prius

Hey guys;
I changed out yet another bulb that went out yesterday driving home that I bought less than 6 months ago. I found out too late about the tsb and obviously well past the 36k, so I have been just dealing with changing out bulbs. I also did the H9 bulbs for a little while, but wasn't much difference. Anyways, So now I am thinking about adding an HID kit and was looking at this one from TRS:

HID SYSTEMS H11: MORIMOTO ELITE

Those of you that put an HID kit in your car, I would like to ask you some questions:

1) Is this the best one to go with for the money? I saw another kit from xenonsupply that seems a little cheaper. What is the best kit to use?

2) How does one find out the legality of these for their home state? I live in Indiana (NWI to be more specific) and I also drive to and from Chicago (for work). I tried googling for info, but didn't find out much. I only ask because I have seen info online stating that some states say they are only legal if they were oem on the car-something having to do with the headlight assemblies not being designed for HID causing distractions to other drivers.

3) Any issues with them not working in the cold? According to the guy at TRS, I shouldn't have a problem as they supposedly froze them in ice for a month.

4) Pros/cons of doing this?

5) Am I missing anything?

Thanks for your help,
H00si3r