I've found the 'Add by Selection' to be a really useful tool. I use them to easily find a cheapest quality product at any time and any country. There is one flaw I find disappointing (not towards the staff) however, which is the lack of ability to add / remove products to the already made parametric selection. This can be annoying when creating a massive list of products to find a new one release the next day, and so I would have to re create the list in order to incorporate the new product.
Thanks! I am really keen to see this as a feature, however I know the great staff are very busy so I'm not expecting this soon.