I dont like topper!
English beds are very different to the Swedish (Hastens). They overstuff and then compress very firmly, so that the natural stuffing is held under a high tension from the tufts. The swedish beds use less stuffing and rely more on the topper which is not compressed nor held under tension.
in my experience the english beds are less likey to form body impressions and the maintenance is less than with the Swedish.
I bought the Hastens solely on reputation. The first 2 nights were great, but the concept of the topper over mattress doesnt work for me. Because the horse hair in the topper is not held under tension and tufted (like it is in a Savoir topper) it compresses very quickly, and despite kneading and rolling and all the other maintenance you are meant to do, you just cant get the same level of top layer softness/suppleness back. Also i turned and rotated the mattress every 3 to 4 days and its just a pain as it is really heavy and unconstructed to flip.
so i bought some Relyon beds (clarence and emperor)for my kids and before i gave them to my kids i slept on them and thought they were great. The top layers are very tightly compressed so they give great support while at the same time being soft and pliable. So far there are no body impressions whatsoever and it been a couple of months. This compares with the Hastens where the topper compressed almost immediately - to be fair the Hastens mattress has no impressions on it at all after 14 months. To those who have Hastens no disrespect - I have one too. I currently sleep on the Hastens without the topper.