i've used both switcheasy's cover buddy and tunewear's eggshell before and switcheasy's product is definitely much better & durable in terms of quality. unfortunately switcheasy doesn't release their products @ the same time that the ipad lauches so this was why i had to stop using them as of the The New iPad. i remember when the ipad Air came out, switcheasy didn't have their cover buddy to sell so i had to stick with Apple's smart cover. been using Apple's accessories ever since then, until the iPad Pro now.
if you can wait for the new switcheasy coverbuddy for the iPad Pro, then i'd recommend you get that instead of Tunewear's eggshell. the eggshell, like it's name suggests, is just too brittle, imho, and is more prone to cracks & breakage.