This is what a German user, Tobias Jan, told us on Facebook:
"...Padding is comfortable. + with the additional straps the main belt stays in position... The main benefit is less back pain because of blocking the pelvis rotation, Additional benefits are: - Tied down in the chair i feel more like one unit with the chair - better power transmission arms-wheels. - Better movement of the upper body without risk of falling out of the chair. Don't need one arm to hold on. - I can fasten bags on my lap. In summary the 4-point belt allows me a comfortable, relaxing and pain-free sitting and driving the wheelchair."
Thanks to Tobias for sharing his setup and thoughts -- and we would love to feature yours!