1.5 years later and...

I'm not sure how I'm the first to review these after over a year and a half. But these are amazing and likely the last pair of poi I will buy unless Flowtoys comes out with something better suited for me.

TL:DR; at the bottom

I purchased 2 sets of these and had them converted into a single symmetrical "nunchaku" style props. I put in my specifications and they were delivered exactly to my measurements.

These things are TOUGH! I'm not a rough or heavy spinner, but drops, hard contacts, etc happen and these have shrugged off everything I've given them without so much as a wince; Sand grass, concrete, wood, tile, and all. The caps keep them pretty well sealed and sand out. While I don't normally let beginners spin these, more so they hurt more if you hit yourself or someone else, I wouldn't be worried about them damaging the cases or internals/lights inside.

The lights and patterns are beautiful. If you are just using the V1s or V2s with only 2 LEDs per side, these have 18 per side. With all of the extra LEDs, it really paints a fuller picture of the pattern. Currently there are 3 "Pages" of light patterns with 8 - 12 different settings per page, but you can save custom setups for each unit on the 4th page. There is also a secret page with ~50 experimental and custom patterns. This is where I spend most of my time spinning. Over the time I've used these, there have been several firmware updates that have improved the functionality of these as well as my happiness.

Also these lights can get BRIGHT! Like "Why is the Sun yelling at me!?" bright. Obviously at full brightness, the battery life will be shorter. Maybe 3-6 hours depending on brightness. I usually keep my lights on 1 or 2 out of 5 when practicing by myself or walking around shows/festivals and then turn them up performing with/for others. I can usually get 1.5 days worth of spinning depending on settings in between charges. Your mileage may vary. If I had to give a con to these, it would be the price/battery life as with the V1s and V2s I could leave them on for pretty much a full festival weekend and still have charge on them when leaving without a charge. But what can you expect when its using 9 times the LEDs. As this is a superior product, the price also reflects that. While I could not of afforded these when I first started spinning, I'm at a different place in life where I can and I know spinning poi has helped me to reach that.

Overall I would say get these Poi. There the best I've ever had plain and simple. I've spun lots of different poi from various friends and people I've met over the years. Some get brighter, some you can upload custom images to, others have cooler patterns, but of all those, these Vision poi get more right overall compared to those others, but in a sturdier package. What those others may do better in a single area, the Vision poi, the difference is very small in my opinion.

To top it all off, Flowtoys has the best warranty ever. I've heard too many sob stories of people buy expensive lights and when they break, they are out of luck, or expected to spend a good chunk of change in order to have it repaired/replaced. I've been using flowtoys since 2013 starting with the V1s, then the V2s, and These and anytime I've had an issue, it has been resolved without any pain or frustration.

TL:DR;

Pros:
Very sturdy product
Bright
Beautiful patterns and lights
Easy to use and switch between modes, settings, and pages

Cons:
shorter battery life. (As compared to Capsules with 1/9th the LEDs)
More expensive