Every time I used my Vision 4 I was getting harangued to "upgrade" to 12.2.0 from 13.2.0, so finally did it after the Vision locked up twice today. 12.2.0 is a little snappier.
If anyone is interested in a Vision 4 in the U.S., a seller has two of them up for sale on eBay. Both supposedly in good shape — I've never dealt with this seller so I can't vouch for him/her or them. One is selling for under $50 (including postage), the other is selling for under $60 (includes postage).
Under $50.
(now $43.61)
https://www.ebay.com/itm/Tolino-Visi...item216a4027f1
Under $60.
(now $53.83)
https://www.ebay.com/itm/Tolino-Visi...item1ce2cda7db
They both say "Very Good Condition" so I'm not sure why there is a difference in price.