Don't waste money they basically cut and pasted old info under new heading. The practice tests are abysmal the previous reviewer gave the specific details

After using three times the dome is starting to crack in four places. I carefully clean the dome after each use by hand and never stress it in any way. I will keep using it just to see if these crack are going to present a problem with continued use. For the price if it lasts thru the summer I will feel I got my monies worth.