It looks technically very good, but:
Of the two testimonials I clicked on, one went to a non-existent site, the other went to a site that had died a long time ago and had a blank front page, no products, and no cache in Google.
When I searched for 'ShopperPress review' all I found were endless drone sites that gave the appearance of being affiliates on the make (search for 'ShopperPress Coupon' and you'll see why), and when I searched for 'ShopperPress sucks' or 'ShopperPress problems' there wasn't much to go on, indicating that it hasn't been around for too long since all software has weaknesses.
When I looked for information about who was behind the site - a real life address, a bio - I couldn't find anything.
When I went to the forum I couldn't get to read the posts to see what the common problems were and what support was offered.
When I read the installation document I couldn't get any indication of how flexible it was, though all the themes looked pretty 'samey'.
It all reminds me of another (unnamed) plugin that was great on the surface but (IMO) turned out to be an inflexible lump of crap that wasn't going anywhere.
Any genuine reviews or comments - excuse my cynicism - welcome.