The QS6.1 is described as "built like a tank," indicating robust construction, but its lack of a resonant filter is noted as a historical design flaw.

The QS6.1 offers a solid key bed with aftertouch, and the pitch/mod wheels are noted for their weight and ergonomic placement.

Owners suggest checking for a loose connector or fuse replacement if the unit won't power on, before considering costly repairs.

The QS6.1 lacks resonant filters, which limits sound modification capabilities, despite having a filter feature.

The QS6.1 features a complex tracking generator envelope and a mod matrix, allowing deeper sound manipulation despite lacking resonant filters.

It supports stacking sounds and spreading them across the keyboard, enabling versatile sound layering.

It connects to DAWs via standard DIN MIDI ports, compatible with any MIDI to USB interface.

Some sounds are unique compared to other romplers, with specific sounds being highlighted as irreplaceable even without expansion cards.

It's highlighted as an excellent MIDI controller, with programmable sliders for MIDI CC and quick MIDI channel changes in PROGRAM mode.

Repair costs may outweigh the value, given working units are available for $200-$250, while repair labor can cost $75-$85 per hour.

Priced around $250, the QS6.1 is considered a good deal, especially when found in pawn shops, given its robust build and sound versatility.

The Eurodance PCM card adds sampled trance instruments, enhancing the QS6.1's sound palette.