It seems a very well-specd machine for the money, but as I don’t speak German I wasn’t sure what they were claiming.
They say it’s a Ruida, they show an Ethernet cable in the accessories, I would do as Bernd says and ask exactly which model of controller is installed.
The bed size would bother me less as it has pass-through doors should you need to cut larger objects.
A Reci is nice, but on a machine like that an SPT or Yangli would be fine. The tube supplied by the OEM will be a cheap brand, but will probably give you decent service. Certainly good enough to get to grips with the machine. Reci are popular with industry because of their long life. Functionally I prefer EFR and SPT. Tubes are consumables. Be prepared to replace them. I have Reci because I don’t want to do maintenance
If you are in business and looking for a business-capable machine, I would look at spending a bit more and getting better quality - a proper chiller is imperative, a bigger bed and tube also - we all think our machine is big enough, until it isn’t.
The vendor is a reseller and likely has no tech support, but see if he can give you better photos, especially of the rails and inside the controller cabinet.
If not, walk away. It’s a competitive market and if he’s only in it to make money with no effort, you don’t want his product.