I love Eggs. I use to cruise an old 37' wood. Just a great boat. I figure I am just one more boat away from a 37-42 egg.
Here is what I got for you; Nice and heavy (not as sinker, but tough), well built, Very roomy for their length ... Also, they age well. Look at a golden egg from say 88' they could still be coming off the floor they look that good. Not all brands can do that. Look at a Bert (nothing against Bert's people...) But I can tell you what decade they are from just by glancing at it.
But - The 80's early 90's Eggs have only one problem that seems to concern me which is that they have a ton of glass supporting the flybridge. Great view, yet. Not always strong enough though . Apparently this is not always an issue, but look around the tops of the windows from the inside and look for stress cracks. This could indicate excessive flexing which may have to be addressed.
What a lot of older owners have done (and all new Eggs are this way) is they glass over the front windows. Its a great fix. It adds a lot of rigidity to the boat, makes it safer in rough conditions, and updates the boats look dramatically. You can probably have this done for about 6-10k depending on where its done.
I wont get into the Gas vs. Diesel discussion. The advantages of diesel are obvious. You will pay extra, but factor that into resale / maintenance/ fuel cost/ and you'll be paying more for less headaches in the future. There are a lot of both out there.
I'm a big Egg Harbor fan. Sure they have flaws, every boat does. Get a good one and enjoy having a great riding , great looking boat.