Ricoh gxe3300n

I am needing to purchase new sublimation inks for my printer. I haven’t run the business for about 10 years (except a couple ont shirts a few years ago).

I have only ever used Sublijet inks but have noticed a company called Sublisure selling sublimation inks a lot cheaper than sublijet.

1 - has anyone used this company and their inks?
2 - are they any good? Differences between them and Sublijet inks?
3 - I only need yellow and magenta but if I went with the Sublijet would I need to replace all 4?
4 - would I need to get new software as I am using a VERY old system (XP) and it works fine at the moment although I have a MacBook and wondered if I could use this for the business.

julie