Must say I had some rigid ink in black and man it was awesome to print to with but I'm not sure it was £20 better than the other stuff I use which is BQAfter watching various videos on YouTube when I got my Ender3 I decided it wasn't worth the hassle of trying to buy cheaper filament.
The £15-20 saving didn't seem worth it for the trouble it might cause. Went for Rigid.Ink PLA and PrimaSelect PETG when I realised PLA wouldn't work for what I needed (Was all amazon could get to me fast enough)