Would you think the TS5020 (or an MB2120) would be a better investment than a pro-100 s? In the long run I mean, compared to equities so to speak..I have 1-used 4500 as well as 2-new TS5020 waiting as well. I bet I will make at least 100% return on the TS5020 if I sold it next year. Better than equities...but strictly on a percentage basis. Would take a warehouse full to fund retirement. I also stored away 2-MX870s. These machines are excellent but slow. Ideal for the casual user. My sister was given a used one for 5 years now and I have not had to help her at all. That says a lot. The MX870 does not conform to all the new wireless standards so I had to install an older router as a switch to allow Wifi connection. That was the reason the seller sold it, he had wireless issues but did not know why.