Catalytic Converter from Eurocarparts + Lambda Sensor - any good?

They sell the cat converter for £399.99 (but always have a fake JUST about to end discount that makes the price £267).
I can get a very good price for the part (staff discount).

How does their unit compare with the Klarius?
I found a seller on ebay selling for £180 with kit.

The lambda sensor, on ebay, I can get for under £50.
Eurocarparts - it's like £72.
My friend who works at Euro Car Parts said he had heard of many sensors failing after a short time, so better to go for a more expensive one.

Problem: they don't sell a fitting kit.
My friend said that the mechanic could do without - it's just a couple of nuts and bolts.

Any thoughts?

Thanks.

 

I thought I'd give an update...
I got delivery of the part just now...
It's a Klarius

I called Klarius yesterday and asked where I could buy.
The said Euro Car Parts.

I called Euro Car Parts, they said they sell the item, but didn't have stock currently. They also said it was a much more expensive part than the 'React' one they have advertised.

On the receipt: List Price £1382.10. OMG!
So... this is the cost if you go through insurance.

No fitting kit though - I did ask Euro Car Part about this, but they said they don't have current stock.

There are plenty of 'exhaust Klarius fitting kits' on ebay. I'll call Klarius tomorrow and find out which is the correct fitting kit.