Backup Camera systems

[CT Tim]

There really isn't a heading for this topic to fall under, but I figure anyone that is concerned with car appearance such as myself might have one of the reverse monitoring systems (so we can avoid anything costly). I just purchased an Impala and am finding that it is difficult to guage the distance behind you in general but especially with parking.
I was wondering if anyone here has purchased one of those reverse camera systems and if you have and could maybe lead me in the right direction regarding the certain kind, your experiences, etc.
Thanks in advance for any replies-Tim