I own RICO SP 210su model and some of the things that I found out is,
1. If you are going to use it with MS Windows, then both scanner and printer works, if on Linux or *BSD then only printer will work, scanner is no go(drivers are for Linux, *BSD are available on github, not from official site, officially it is not supported).
2. Tray 2(single page feed tray), its is easy to insert the paper at an angle, not a big issue, just so you know thing
3. Replacement drum, cartridge, toner are all available on amazon.in so you can replace/refill them with ease.
4. Toner reset chip is also available on amazon, 3 for 300 I think so you are good to go there. If you want to diy then that's also possible there are enough guides online. If you need help let me know.
5. The OPC drum(the green thing on the cartridge) from the original cartridge will last a long time but the ones you buy as replacement wont. My original is still going strong after more than 5K prints but the replacement went out after around 3K prints, may be it was bad luck, may be something else so just so you know.
6. If you want to scan legal documents, about top or bottom 2cm will be lost as the max you can scan is A4 size.
7. The rubber pads that are at the bottom wont provide enough air circulation so put a small wooden pieces each and that will do good.
8. If you take more than 30 prints at a time, wear a mask, else you will be berating toner power for sometime.
Regarding Maintenance, This one is almost trouble free type of printer, if you get black shade in printer, remove the cartridge and wipe the OPC drum with clean cloth and you are good to go.
When buying,
1. Check the cartridge, opc drum for damage,
2. Check if the cartridge slides smoothly into the printer also check the channel that guides the cartridge, sometimes they might be broken.
3. Check the paper tray, and see if the printer can pull in single sheet without difficulty. Some of the wheels on the paper pulling system might get worn off or damaged.
Hope this helps