I started using the Flame Kings the moment they were available (about 5 or 6 years ago). I now have 6 tanks total and I’m guessing the oldest ones have probably close to 50 refills on them. The do have a rated use life of 13 years I think. I did replace the o-rings on a couple of them last year that were leaking a bit (during refill). However, they all work well and look like new.
They have paid for themselves many times over, and I highly recommend them, however I am curious to try these new Mr Heater tanks, as mentioned there are some possible improvements to the design. Just going by looks, here some things I can see.
1. No hex wrench needed (I’ve lost a couple)
2. Black in color which “might” help in keeping the tank a bit warmer in the sun but will also maybe keep people from mistakenly throwing them away (different color than green).
3. Looks like it comes with a decent cap. I purchased brass ones for my Flame King tanks as the plastic ones are cheap and not really made for long term use.
4. At $17.99 price point and with the Mr Heater name, they will be a competitor for sure.