I have shoprunner and the two day shipping is somewhere between blatantly not true and thoroughly misleading. It is two days from whenever it ships not counting Saturdays (or Sundays, but that is standard). So I ordered something on Wednesday morning and it didn't arrive until Monday, which is a little ridiculous. For something that is clearly positioning itself as an alternative to Amazon Prime, I think it is very misleading.
I got a year trial membership to shoprunner and I just LOVE it! You can get free 2-day shipping when you use shoprunner and there is NO minimum order!
I have used shoprunner several times during the free trial period. This is an excellent service for the price, if you're a frequent online shopper. I like that I was able to sign up for a month-to-month basis, because I usually only shop online during the holidays. It is a great option to be provided. I intend to keep the service for one month beyond the free trial, in order to save money on shipping costs through this shopping season.