Refillable Gas Systems

Ok here goes - being a Safefill owner that is the one I know most about and I like it because I can see the level of gas - it is lightweight and the saving over the price of Calorlite is substantial if you are a heavy user.  It makes even more sense to use a refillable if you are going across the water as you can refill there - whereas Calor is not obtainable (not anywhere I have been anyway).  There were three sizes but the grapevine said the smallest has been discontinued. 

There is also Gaslow which until I saw a recent post I thought was a permanent fixed refillable probably more convenient for a Motorhomer, but I see they have free standing cylinders too.  When I looked at Gaslow it appeared to be far more expensive to set up for a caravanner than Safefill - but I could have been looking in the wrong place. 

Gasit - is another I believe but I know nothing about it.