I don't have a Luminaire, I have the Viking Designer Topaz 20 and I love it. When I got it, it was the floor model, and being sold with a discount and a full warranty. If it dies I will get another one of the same series because mine is no longer made. But it is still supported by the dealers for repairs. And my dealer gave me a year to upgrade with full trade in value. I have had it for 6 years now and so happy I got it. So decide what you can afford and go for it.
I don't have room for a long arm or even a mid arm machine - (my sewing room has my 15-91 w/cabinet, Damascus treadle, Janome MC 6600P in its table, and my Topaz) it's a pain to put machines away, so I don't. Also, I like to leave my ironing board up all the time, luckily my cutting table folds up to make a full length mirror. Since I embroider more than I quilt, most of my quilting is sent out. But a local store is starting to set up lessons on long arms and then you can rent their machines, and I am seriously thinking of doing that when the current situation is over. After I am done making face masks, then I plan to try a QAYG quilt with my embroidery machine.