These panels are easy to glue & fix, except if used on ceilings, where gravity will fight your glue and your patience, so do take care.
Their effect on the room acoustic is even more (positively) apparent and useful than the Vicoustic graphs & specs might have you believe, so it's money well spent in this category, as you have to look for proper glasswool/rockwool acoustic panels to get better results.
The shape is nice and neatly executed, only the withe fabric stretched across the front is perhaps not as white as one might think, and the fact that it's stretched over greyish coloured foam makes it look even a tad darker, so watch out if pairing them with other white elements or placing them on a truly white wall, or embrace your...
50 Shades Of White.
;)