People are trying to catch up with the Deus. The Nokta units have come along, and the Quest Pro is not far away (another with multiple frequencies) but the problem is, XP have taken it further with the HF coil option, while many of the wireless lightweight contenders coming out now are still stopping at 18/19khz.
There are so many good reports on the Deus at 28khz, and the Equinox 800 will have 40khz, subject to the latter being as good as they boast, these two machines will be above the competition IMHO due to those high frequency options.
How many more to come? A lot I reckon!!