A landscape friend of mine needed to borrow my 465 so he gave me his 70XT with VTS track system to run for a couple of days. Day 1 I mainly used the 70XT to move rocks around during a rock retaining wall job. The VTS without a doubt adds to lift capacity. By hw much I would only be guessing but safe to say it is substantial. It seems that the travel speed was reduced from a wheeled machine (this 70 was a trade in of mine so I was familiar with this particular machine). Day 2 was most telling. I had to remove about 12" of material over 15000 sf for a retention pond. The ground conditions were mostly hard loamy/clay type material. The tractive effort of the machine is incredible. The VTS adds 3200 pounds to the machine. The 70XT had around 85 hp. The machine had an 83" bucket and the material would boil over the bucket. I spent about 4 hours hogging out the retention pond. I was very impressed with the power of this combination. I pushed the spoil piles about 15' in the air and it powered right up. The Cummins motor is a hoss. I came away tonight very impressed with this system. I could only imagine what a VTS system on a 465 sized machine would be like. However, even on the 440 sized machine adding the VTS will give you a substantial boost in productivity, both in lift capacity and excavation type productivity. It is tempting. The only downside is I can see is the VTS will wring out everything a machine has. The 70 was lifting loads well beyond the spec sheet. Its ability to push material is certainly well beyond what the machine was built to perform. You would want a good operator in the seat. I think abuse would start to show itself after sometime.