I’ve got the grillstream and used it in both modes now, it’s great. Now it’s run in the gas taste is better, still not quite as good as charcoal tho. Used it with Weber briquettes for first time on sat and it was so easy, ready in about 15 min and taste as good as normal charcoal. The great thing is you can switch to gas if the charcoal runs out, or run one half on charcoal and 1 half on gas...
If going charcoal, Weber are ok but imho overpriced for the features, I went with the napoleon kettle because of the cast iron adjustable height cooking grill, and hinged lid.
That said I did get my mum a Weber MasterTouch because I found it as an end of season bargain for 110 quid!
I still use the kettle if having big parties but generally for the 3 of us just use the grillstream gas now. You do need to plan a bit more with charcoal to allow for the heating time but definitely use a chimney starter....