I'm a huge Sebo fan, I love the X range, Felix, BS36 and my K3 is my newest addition.
Nar's comments about the K3 are interesting, I agree the electrics of the hose/wand seem to be an issue.
I got mine second hand, it's 11 years old according to Sebo.
It needed a new hose as the previous owner had split it. I got a new one and re-used the previous pigtail connector, I can only presume it's the original, but it might not be, however it seems sturdy.
Next I found the wand connection at ET-H powerhead was faulty, it had become loose and had obviously been arcing, damaging the connectors.
I was able to get a new wand from eBay for a good price and then used the wire from the inside of the old wand to replace the original faulty connector. Sebo won't sell/source those, when I enquired at the vacuum shop he told me he refuses to sell electric based Sebo as they just cause problems.
The hose isn't as flexible as it should be which is a pain, but I do love the handle operated on/off and speed control, this also allows the cleaner to run quietly. Something the X series cannot do. It is also a short hose, but for use in a small house it works well enough.
It beats the other halfs Dyson handheld cleaner, even when it's on its lowest setting
