When you put things in perspective they aren't that great value for money. You can go to Hattons and pick up much better detailed Bachmann, Vitrains (like the lovely 47 in Anthony's other video) and Heljan diesels on special offer for cheaper or similar prices to a €60 railroad loco and they'll have proper chassis too. The 55 for instance is terrible, too short by a large margin, tooling over 30 years old now, crude detail, HO bogies, non flush glazing. The 73 is still a superb piece of tooling mind you, and offers a cheaper alternative to the Dapol loco. They have pick-ups on both bogies, a major advantage over the old lima locos they come from.
And as for the haulage test? Well, lets be fair, Hornby Mark 1s and Dapol/Airfix/Hornby Mark 2 air cons weigh next to nothing. Stick them on a rake of your MIR wagons, then I might be impressed.
There's no doubting their smoothness, and they are a decent motor bogie, but nothing will beat a central can motor and flywheel drive powering two bogies. If it did, we'd still have our 141s and new 201s powered that way. If the railroad bogie suits your needs then fine, I'm still going down the all-wheel drive road.
And don't even get me started on traction tyres!!!