Not enough user friendly, but works fine!
Some settings you can only change in a text file (ssh_config). And this needs some investigation… In return, it is very well configurable! Related to Terrapin Attack, in newer versions you must manually reenable some old algorithms to work with later SSH servers (for example ASUS Routers). But the app does not tell you that and this is too only possible through the ssh_config file. You can also do not get easily the info which old algorithms you need to reenable, so you reenable all of them. This makes the whole thing pointless. When connecting to old servers, the app should warn you about the old alogirthm (tell you the exact alogrithm) and give you an option to reenable that through the GUI! That would be user friendly. I purchased the app long time age and was very disappointed when it suddenly stopped to work and I needed to investigate why…