HPA 1 : Perfect for drummers or silent rehearsal for bassists/keys

This is a great bit of kit in the respect of build quality, battery life, features etc

Having being a bit more expensive than other similar products didn't phase me, but you get what you pay for in the respect of build quality - the plastic has an almost velvety quality to it.

Being able blend between 2 audio sources in stereo mode is great!!!

It's downfall purely depends on your planned use for it. I used it primarily for onstage monitoring with a bass/track feed in L/R respectively. Having XLR cables dangling from my belt was inconvenient and definitely restricted movement onstage, therefore I have upgraded to a wireless system (also LD systems). However, I still use this for silent rehearsal. Plugging a jack to male XLR cable from my active bass, and an aux cable from my laptop allows me to practise at home without firing up my bass rig, or even my smaller practise amp.

A monitoring system for drumming gigs is also great with the HPA1 due to not having to move.

If you need it for one of these applications, I'd highly recommend it.