The XL is an ackward tank.
The air vents/blades are fiddley and quite sharp! I've had chunks of skin taken out of my fingers a few times now. The coil doesn't always connect with the pin in the bottom of the tank very well, causing Ohms to fluctuate all-over the place. Everytime I build on it, I have to push the centre connector back down using a screwdriver. If you build the RBA, they leak, I mean really really leak unless you are an absolute god at wicking. I'm fairly good at wicking, mine leak everytime I refill.
On the upside it looks great, the large chuff cap is awesome and if you can build the single coil RBA and get it wicked right, the flavour is immense.
As someone said before, it's an advanced user tank, get it right, it's brilliant, get it wrong and it's a leaky, messy nightmare.
Mine spends most of its time in the cupboard now, only to be brought out if I fancy a challenge.