I have 3 auto shields.
One was around £100 and is a Speedglas one which takes a battery.
The second one is a HobbyWeld one which was around £70. This is a solar powered one
And the third one was a bit of a novelty one with skulls and flames on it.Also solar powered and around £25 on eBay.
All 3 work perfectly but i do tend to use the Hobbyweld on the most as it is more comfortable IMO But the £25 one works as well as the dearer ones and i have had no trouble at all with it.
What you need to make sure is that you have it set up correctly. This is the most important thing. Reaction times and delays need to be spot on. You don't want the shield to slowly fade to dark when you start welding, it needs to go instantly dark.
If you are not doing much welding, then there is no point spending fortunes on an expensive shield. However, i would recommend the HobbyWeld one all day long.
Remember you will need a decent pair of Gauntlets and preferably some fireproof overalls to protect you arms.
I cannot comment on the welder as i have never used that model but lots here love them so must be decent.
Ben