There are those that will find the negatives in this. The reason being.. they find negatives with everything, generally being negative people. It's pretty clear reading through the posts. This has nothing to do with logic, it's just they are negative people.
Personally, I don't mind this deal at all. I'm not tied to Matthews long-term, and am concerned about his ability to physically be healthy enough to perform when needed, and maybe just overall concerned about his ability to raise his game when needed. I'm patient enough to not want to throw very talented players overboard yet, but would say this gives us enough time to make future decisions. He's been THE best goal scorer in the league, since he joined, and it's hard to replace that, and he's rounded out his game well too. But, we need his wrists healthy, and we need his BEST in the playoffs, and we haven't seen that yet.
I like that there are no NMC/NTC in this deal. If it's not working out for us, he'll be moved, and that's a positive for the Leafs.
He's a star, and an incredible goal scorer when healthy.. but he hasn't always been healthy, and that's happened too often. We have five more years of control, so if it doesn't work out for us, we can still trade him for a randsome, with two to three years left on the contract.
I get the desire to have him controlled for 1 + 8 years... but I think given his wrist problems, and our lack of playoff success, and likelihood an 8 year commitment from Matty likely means NMC, that this is the better outcome for us.