I think it's a legit question and (if you don't need a commercial invoice) now is a good time to acquire a series 3 on eBay. The prices are considerably lower than in the first few weeks after the release but you'll still have 8 more month with the latest model.
I have the 3/LTE now and I had the zero for its first six months before I lost it.
I bought the 3/LTE to try it out and am keeping it because it changed my experience the same way the zero did.
The zero got me exercising to a certain routine but then became a pain to charge daily and at the time (six months after it debuted), they took away constant heart rate monitoring in the software perhaps because of battery concerns. So I managed to lose it. I give it credit though for giving me the exercise routine that I use to this day.
I ran into 2 apple employees who still have the zero. Neither use it for exercise. I told them both that the 3/LTE is a new experience and they should try it. Apple has the two-week return and they are confident in their products if people try them.
Here is what the 3/LTE has done for me in less than a month.
I. It changed my exercise routine again.
Because its fast with app switching and has the dock, I found it easy to set up workouts which I supplement my current exercise routine with.
I really like the fact that it has tons of data on heart rate and it measures heart rate variability which I am using as a relative marker to see what my system likes better (warmer is better than cold weather for my heart).
Its measuring stair climbing so that is giving me incentive to climb more stairs. (you can do this on the phone).
The GPS gives me an easy way to see how much I walk. I didn't know my current walk was so long. I didn't know also that I am accustomed to it and the watch doesn't think it is much exercise for me.
II. Music
One of the best things with the LTE vs the regular 3 is that it has more storage for music. I loaded a bunch of recordings on my iPhone and then synced the playlists over to the watch (its annoying that I have to put them on the phone first though). Using an app called pod2watch, i can put podcasts directly on the watch too.
It also has apple radio for free but you need wifi or LTE to use it.
Listening to music on the watch requires AirPods or some other bluetooth.
III. The Band
I really like the sports loop nylon band much much better than the sports elastomer. Its so light! (You can get a knockoff for the zero on Amazon.)
These above are all things for free with the watch and you can get some good deals where the LTE is the cost of the regular one now (BestBuy refurb for example).
IV. Other features with the 3/LTE that might cost money
A. Apple music can be streamed and controlled through the watch but costs money. I'm not ready for it. I am doing subscription services now but top of my list is to support good press and then there are subscription services now for movies in theaters and they are taking my money also (sorry apple).
B. I would consider the LTE service but $10 plus $$3-$6 taxes a month is too high. I might try it if it was $5-$7 all in. I am thinking when the new watch comes out, maybe the prepaid services will be allowed to sell the old watch with service like they do with old phones. Right now the watch is locked to the big carriers.
C. It is waterproof resistant so I could go swimming but would have to join a pool. Might be something for the future.
I bought the LTE at best buy. It was a refurb at same price as non LTE so OK deal. It was called refurb but never activated so Apple is giving me full warranty. Some of their refurbs though are activated before they are returned--it is luck of the draw.
edit: Battery goes down by 50% in a day with modest workout and wearing it 24/7. It charges fast. I got rid of an app extension that I thought was using too much battery but am not sure. I dont keep a lot of apps on background refresh, just the apple ones.
edit2: I am imagining the watch LTE might change again when 5G is debuted. At that point I might upgrade, depending on cost. It is giving me good value now though so i don't regret it. I watch my apple purchases carefully to make sure they give me good value.