My partner has the Gtech air ram - £200. It's ok. nice and light, it has LED lights on the front which is a nice touch. It's not super powerful but ok on carpets and of course fine on hard floor. The rotating brush is powerful given that it's a cordless.
To give you another perspective, I bought a (can't remember the make) cordless one off
ebay, it was about £52 after the offers were applied. it's ok - it is very light, very easy to empty, charges quite quickly and I've done the whole house before on a single charge. The downside is that the rotating brushes aren't that good, and struggle in a heavier pile carpet. Also it's back-heavy, as the motor is at the back. This makes the head very light if youdon't angle it down. These very light machines are often too light for their own good sometimes. But it does me.
I find with the lighter weight cordless vacuums, your habits chnage. They are easier to get in/out of the cupboard so tend to be used little and often. Whereas my corded one is a monster, will suck up a phone charger and rap it round the brush if you're not careful. But it is very heavy for everyday use. As said above, to get the best of both worlds I think you need to go really expensive like a Dyson.
