What KSSS said is good advise in regards to that older machine with that HP. With that said I have the VTS system on a 2011 JD 318D and love the setup. One thing is I can switch to tires for the winter. I bought the setup used and went through it so that I would not have any problems for a while. What things it did need were a bit pricey but no more so than idlers and rollers for a CTL would be imo. I do a lot of stump grinding and Harley raking so I am on "tender" areas a lot that I do not want to fix so the low ground pressure and ability to go back to tires was the clincher for me. I did put new tracks on in the Fall and went with Camoplast SD style which actually worked quite well this winter so I did not switch to tires, and believe me with that huge snow we had here in November the tracks worked really well.
Would I do the same again, probably not. I think next time I will just go to a CTL and get tracks that work in the snow. But, the VTS definitely makes an animal out of the machine and can increase productivity in certain situations.