You will be quite pleased with them. Their prices are fairly competitive, cheap, and have fast shipping!
I do not offer them as a regular diet tho, as they are a little costly, but do get them here and there, maybe once a month, or every 2 months to switch it up a little and offer my geckos a variety of foods, because after all, in the wild, they do not always have just 1 kind of insect to eat! lol... Aswell as the fact of how much higher in nutrients they are as opped to most other feeders... So i get them to make sure my geckos are getting enough calcium and all that in their diets! And all my geckos i have ever fed a butterworm to, have eaten them! Never had a gecko refuse one! So they MUST be delicious to them! lol