I ordered some "Buzz" buddleia (miniature butterfly bush) in late March, which were received reasonably quickly. All the plants were about 3 to 4" tall (yes, inches), with silvery leaves no bigger than 3/4". I hardened them off for a couple weeks (ending with four days in 8+ hours full sun) before planting in their permanent location with basically ideal light and soil requirements that I had inured them to. Plants burned to a crisp within a day and never recovered, even though I babied them for a month, hoping for a few new shoots. Such is the problem with greenhouse grown plants; pale and wussy, like millennials.
It took a few emails to get a response, but GS agreed to send replacements free of charge. That took about six weeks, and then it was the wrong plants. I got full size (6-8 ft) buddeias, trimmed to two 30" stems each, with large leaves and in full bloom. They appeared healthy, but it was weird to get such tall plants in pots 4"x4" across and only 2" deep. Potbound, hairy roots. I immediately repotted, and so far they seem to be doing okay in a shady spot.
Today I got the correct replacements. They average 12-16" tall and are trimmed to four stems. Good looking plants with the same pot and root issue. Arrived blooming lilac and not purple; at this point I don't really care anymore.
All plants arrived via 2 day USPS or Fedex, so very good rating on shipping.
Overall, my experience with GS is okay customer service and iffy plant material.