Product review (2 stars): Exorbitantly overpriced for a single-purpose tool.
While this product does what it was designed to do, it has a couple deficiencies.  First, it is exorbitantly overpriced.  Similar spring expanders used in the automotive industry are about 1/5 the price.  Second, to operate the tool and expand the spring, you have to pull the handles apart.  This method requires the use of both hands.  The tool should be designed so that when you squeeze the handles it expands the spring.  This method would require only one hand leaving the other hand free to help keep the clamp in place or keep your work stable, etc.  If this product were priced at $20 or maybe $25, I would recommend it, but at $85 - $95, it simply isn't worth it.