Speaking as a Photon owner: Spares: I can get these directly from Anycubic in China or from Amazon. I use Amazon since I have Prime and get it next day. I personally feel the spares are well priced. The Anycubic supply their own slicer. Most users switch to Chitubox (seems to be the Simplify3D of SLA/DLP slicers). Chitubox has far superior support structures, allows hollowing of models and the addition of drainage holes. Both slicers allow for 3rd party resins. You can use just about any resin. I stick to Anycubic blue and gray, mainly because of price but also because they are easy to work with (some resins are very unreliable). Anycubic resin generally goes for about £35/litre. The current array of DLP printers are pretty much exactly the same. In the end you pick a brand but the technology underneath is the same. Likewise for SLA printers.