Original is good choice!

After the original eyecup after 2 years your service only was doing shaky, I looked around for a replacement.
When wearing glasses, I wanted to use the Extender.
Regardless of the camera brand, the eyecups are probably not built to last.
An acquaintance with Sony DSLR had the same problem and also to cope with loss of eye cup.
After studying various recessions of third-party products and also the Canon original product, I was willing to spend even more money.
The two parts fit perfectly on my 650D. Nothing wobbles. Since nothing stuck. The seat is perfect.
If this section persevere even 2 years, which is totally ok for this price.
I consider it therefore as a wearing part.
Shipment by Amazon was exemplary.
What more do you want.