Hi there, my first post in this forum..
A gun reel is not really nesessary. It only depends on the kind of fish you hunt.
You said it could be a death trap. Unfortunately there have been only a few accidents because of a reel malfunction here in Greece over the past years. The reason was unpropper filling of the reel. The rope was comming so fast out of the reel that a single thread of rope ,which came out of the reel jammed the whole mechanism.
My opinion is that you get a reel but before you use it, try to figer out how it exactly works. Study every little piece of it. Master it out of the water and later,be prepared to use it safely in the water.
Cressi is knowned for the quality of the products. I assume you have an Apache speargun. I don't think there are many imitation reels for this type of speargun, because the gun has a certain position for the reel.
When you get the reel, do not overload it. I think the capacity is 50-60 meters. I think they are enough.
To tell you the truth I have used mine only one time, but if it wasn't for it, the 13kgr grupper (rofos) would still be swimming
I am open for any kind of questions you may have.