For a semi-more direct comparison,
In the USA:
The Helix Rack + Controller is $1998 advertised price.
The KPA Rack + Remote is $2579 advertised price.
Over on the TGP, Line 6 announced that the Rack + Controller have dropped in price. Now is $1399 for the Rack and $399 for the Controller. So now $1798 versus $2579.
Cheers,
jayson