Need comments on the Artis 2 Life

How do I know what model is the most recent one for a mfg. ? I keep reading “Be sure to get the most recent product” - I did post a question earlier but didn’t make it very clear - sorry.
I would like comments about Siemens Artis 2 Life and the Centra (both BTE Open Fit)

Also is the Artis 2 Life a current model or an older model? Is there a list by mfg. for their most recent products ? Most on-line dealers have a list that includes out dated products.

If I remember correctly, the Artis 2 Life is about 2 1/2 years old and has been replaced by Siemens Life 500.

As far as the Centra, I found this for you:

If you want to get the latest technology, try searching the web or ask your audi. OR, you can always ask us…we would be happy to help.

Do you live in the UK? These aids are free on the NHS.