FWIW, I've seen a pretty comprehensive consensus on the value of buying pre-modded cubes in my time on the forums.
48 point edge mod can be done using a nail file/sandpaper in less than an hour, even if you're a noob like me. I've done 3 cubes, and it's not like the more adventurous 4x4 mods that can ruin your cube, it's pretty foolproof. If you have a dremel, maybe half that time, but I'm not that lucky. Most of the time is taken up splitting edges to remove torpedos so I can file round them, in my experience!!!
My current main is a 55mm Zhanchi from UkCubeStore. It's 48pem'd, which isn't probably necessary on the Zhanchi, but does make it slightly smoother and quieter. I've rounded-off all sharp edges and hard lines on all the pieces. In all, it probably took about 3 hours, and has made negligible difference to my times, but a marked improvement to the feel of the cube. Out of the box, it was clicky and fast; now it's far, far quieter, smoother, and silky. Still fast!
I'd imagine Lubix would do a fantastic job of modding and lubing a cube, but there's nothing they can do that you can't do yourself. Donovan is very forthcoming in publishing their modding techniques on their YouTube channel. So it really depends on your priorities - if you want a cube that's silky smooth out of the box and needs no time or effort from you, go for a Lubix cube; if you're prepared to invest a few hours of your own time, buy a DIY.
Every cube I buy now that I can't get DIY, I end up taking apart, lubing, modding (if I can be bothered, or think it's necessary), then putting back together. Once you've set a cube up yourself from scratch you just won't be satisfied with one set up by someone else.
