Could be worth a look at at JRC X-Lo stalking chair. i bought it to replace an old fox chair. it is aluminium, incredibally light weight (in comparison to what i was used to), has a low profile making it suitable for keeping low by the river or lake.
It is also comfortable and quite wide. Only the front legs are adustable, but this seemes to work well and if weight is an issue, it is definately lighter due to this design.
I don't know if you can mention the site where I purchased this from, but if I say 'AMAZON' rainforrest - you should get the picture.........
One thing that does bug me, why don't chairs come with a carry strap???? I have seen some 'luggage' that holds a chair - but that is rediculous..... (if your moving a lot...)
note: this was an impulse buy, i did not test loads - but impressed??? yes...... doubles up as a gaming chair!!!!! anyone for 'Black Ops'?????