@bean -
Yeah, I got the BLTouch because it was all the thing when I first started... found it did work, but mostly because of variations in the bed itself. Since I did the 12" x 12" mirror tile mod, it's so flat, so repeatable (even after swapping tiles) that I just tweak as it's printing the brim myself. Still getting the hang of that... and of getting a level coat of hairspray.
Great thing with the mirror tiles is they come 6/$10, so you can just take a tile with a project off, set it aside, and move onto the next print with a new tile. Uniformity of the glass is actually pretty amazing... you can swap in a new tile and just tweak without releveling. While you're printing the next item, the last one separates by itself from the glass as it cools.
I usually don't relevel unless the printer's been still for a few days; of course, that's probably a bad habit I'll get out of as I get to be less of a noob. I still forget to put the filament away in a dessicant bag when I'm not printing sometimes. Okay, a lot of the time. Like right now.
So far I don't regret not splurging on one of those expensive full-bed glass build sheets. We'll see how that works out in the future.
mnem
*Silicone Gel-ly*