I have a similar bad experience with FSL like you. I ordered the Pegasus and waited many weeks. When I asked them about delivery time, so they did not answer. Only after several urgent e-mails. When I received a printer, so I had problems with the printing and I had to wait for udpate of software. After several prints it damaged PDMS VAT. So I had to buy supeVAT. It cost next $ 250.
The printer is working now, but I am not satisfied with it.
I want to sell it, because I bought the M-ONE MAKEX. With M-one I am extremely satisfied. I had received it a week after order and everything works OK. Also, I can use a third-party resins. This is a great thing because FSL wants 1500 USD for a software license which allow use third-party resins - that is something outrageous.

So... also I do not recommend 3D printers from FSL.