I don't have the 18, but I have the 17 and think it is a great little model.
Is yours an Evolution version model? Tanaka addressed some of the original version's weaknesses with the Evo release supposedly.
I had a couple of issues with mine out of the box, which might be unusual. Those centered around getting proper barrel action/tilt upon cycling. It purrs like a kitten now after a few minor adjustments.
Will you be "firing" it? My recommendation is to fire it!
I think that is the beauty of these models to me!
And if you DO fire it, please share a video!
Be cautioned though, replica model guns like these are not made of highly durable materials!
Happy to have another forum member here - have some fun and ask questions if you have any!