Product review (5 stars): Great tool to get the job done quickly and easily.
Great tool, a little pricy, but cheaper than having a repairman come out and fix.  The way I look at it is for this tool and the replacement door seal, it cost around $125.00 total which is much cheaper than having it done by a professional.  You probably can figure out a way to do it without the tool, but with the tool both springs go on in 5 minutes or less.  I recommend using this tool rather than the one with the angled ends as this is easier to position and hold rather than having to do so at an angle with the other tool.  This tool works fine on both the front and back springs.  Like they say, having the right tool makes all the difference.