Instruct: Classify a given review into positive or negative sentiment.
Query: Perfect solution

I'm a professional keyboard player, and gig with the Ampwedge weekly (on average) playing jazz, R&B, funk, rock, etc. I use this with a Yamaha DXR8 powered speaker to monitor my keyboard rig. The Lange Ampwedge is a elegantly simple solution to a longstanding problem. I've tried to angle the DXR8 and a number of other speaker solutions to better aim it for monitoring - using direct boxes, gaffers tape rolls, and just about anything else that was handy at the venue. The Ampwedge is light, simple, non-slip, effective - perfect for the job. The fact that it is also small and matte-finish means it's not obvious onstage, which is another plus. Highly recommended.