I just plumbed my boat with PEX and found removing these very difficult. I used the crimp on connectors. My conclusion was you do not want to use these connectors if you ever want to remove them. They seal really well and are, I'm told somewhat good on freezing conditions. I had enough difficulty changing them. I can't imagine trying to service one in a seaway.
I have some terminals that will need to be removed. I plan to try the shark bite style and see how they work out.
My suggestion would be use the crimp straps everywhere except the area you may need to service,