This amplifier is part of Hypex’s DIYclassD brand and is priced at 820€ excluding VAT (currently about $885 US). More details can be found at:
The DIYClassD Nilai500DIY 500W Mono power amplifer kit is easy to assemble and enables you to build a high-end mono amplifier at a fraction of the costs
www.diyclassd.com
This is a successor product to Hypex's NC400 amplifier and is a much-improved offering all around. Notably, it was a breeze to assemble as the instructions are very good and an animated build video has been included.
Here are external pics...
Along with a status LED, the front panel has a (smallish) standby power switch. The IEC power inlet is fused and the amp has high quality binding posts. A trigger input is included and Hypex moved the LED brightness control to the back panel. The case has been redesigned (from the previous clamshell) and allows better access to the internals (notably the gain jumper setting).
P.S. Should mention the other standout feature is a 5 year warranty. Hypex reports that the Nilai parts are more premium than their OEM offerings. As posted later, should have mentioned VAT in pricing, so I have updated.