Does anyone have any experiences to share with this product? Positive
or negative?

It sounds like a fantastic product...R6 per inch, which makes a 2x6
stud wall about R33 (instead of R20 with fiberglass batt insulation).
Structural support. No vapour barrier required. Resistant to mold.
Fills in all gaps (unlike batt insulation), so minimal air leakage.
Etc. etc.

I just got a quote done up for my basement (92 linear feet @ R24).
Total came to about $2700 (installed). An 'equivalent' fiberglass/XPS
installation would cost about $1300 in raw materials, and I would lose
about 10 square feet due to added wall thickness.

Does anyone think that the additional cost (2x) is justified?

Here's a link to a local company that supplies the product:
http://www.healthyhomesprayfoam.com/