It’s been modded, which is always a crapshoot. It could be a stellar printer, or they’re lying, or they think it prints amazballs, but has really low standards. Or it could be even more amazing and their standards are just straight up OCD.

From what they say, the mods are fairly common for creality printers.

It’s also super common to mod your printers, especially lower-end brands like reality.

I would suggest asking if they could do a test print- and give them the filament to do it with. Something like a Benchy won’t take too long, or too much filament. Also if it comes out nice ask for what they used as print settings.

If it prints well, 150 is a spectacular deal.