We still don't know: 1. If those planets have water. 2. If their surface gravity is tolerable. 3. What kind of atmosphere they have, if any. 4. What's the mine

We still don't know: 1. If those planets have water. 2. If their surface gravity is tolerable. 3. What kind of atmosphere they have, if any. 4. What's the mineral composition of those planets. 5. How violent the surface weather is, provided an atmosphere does exist. So, there's only cause for cautious optimism.