My family all bought Dyson. We bought a Miele. They all now have Miele. The Miele bags are excellent, easily available, and seal your skin neatly away.
They also service and refurbish properly. When ours had a failed switch, they sent a box for courier, and for £69, it was returned completely refurbished with all new tools. When I queried this, was they said it was all part of the service and just swallowed any extra costs. Excellent service.