Your right there will be quite a lot different.
I think you will find there will be quite a bit of difference in component quality . They told me they repair these things to component level and not board level unless mega busy. Best thing let's ask him to take the lid of it and I will do the same to mine and we can compare. If its the same then why pay over double the price.
Does £550 buy you the 5 year warranty? Why can you only buy them on Ebay? Where's the spares and backup coming from?
As you can see lol I eat humble pie as its the same as the Fecking Sherman. I didn't need to strip down anymore due to possible water damage from my tears cause I really could have saved a fortune. They are a cracking set and if you buy the sherman version at 550 quid I mean WTF for the money. Unless there is some hidden gem like software difference which maybe only show up once welding then who knows . Note this also has the Spark gaps as I see them in the same place. 550 to 1300 is a tad ridiculous to be honest regardless of warranty unless we have a Jasic engineer on the forum that can explain what's going on and why??
Just seen this, maybe I missed the secondary inverter?