Don't have it, but seen it on their site....about $200. Many SSLs and CTLs have very limited rear visability and are constantly backing up on often busy work sites, so I can see their value for many applications. Toolcats have great visability and are not shuttling from forward to reverse nearly as much so I would consider the value as much less.
Unless you have toddlers or young kids running around the homestead (or even an old dog)......then I would say - Priceless !! Or, if you routinely carry bulky items in the rear such as sprayer, sander/spreader, etc. Back-up alarms are around $30 and may help also.