This is the first 8-string guitar I play, so cannot compare to other 8string guitars.
Here's my experience with this Harley Benton:
Playability: fretboard is perfectly rectified. Neck is thin and comfortable, you reach the last frets super easily.
Set-up was unexpectedly already PERFECT! Nut slots perfectly dug, amazing low action and still no buzz at all, exact intonation.
Acoustic (unplugged) sound is good.
Solid and steady bridge-saddles and PU selector.
Mechanics are ok.
Light and balanced weight.
Right size/position/angle of screws, bridge, neck, body, pick-ups, truss rod and everything.
Volume and tone pots work well.
No electrical noise at all!
Beauty: compared to Thomann photos, I do like the real one more (seems smaller...).
I tune the 8th string down to E and it plays definite.
Amazing low price for a 8string guitar!
I have to say pick-ups sound is not wonderful (CLEAN)... BUT: these humbucker pickups come with the two coils connected in PARALLEL (rather than in series), causing a "Duckish" timbre. Since each pick up ends with 4 wires, you can easily rewiring them to coil-split (single coil) or series configuration. I tried and in my opinion timbre is better.
Nut is in ABS plastic, but it works fine.
Considering the price (usually two 8string pickups cost more than this guitar), I give 5 stars.
Still you can change pickups, or adjust the tone with multiband or parametric eq.
Last impressions: the average intergap between adiacent string at the nut is less than in normal necks (6.5mm vs 7.2mm). So it's easier to reach 1st and 8th string at the same time, but you have to get used to smaller distances, especially between thinner strings. Maybe a new nut with constant distance between the center of the strings and not between the borders, could be a solution.