I did a simple test yesterday with my Colorado 300 and 60CSx. I installed them side by side on my bicycle and ran a path 5 times at the same very slow speed. The test took about 25 minutes. Before start I let them find satellites for 15 minutes. During the test 60CSx had an EPE between 2-3 meter (without showing Ds on satellite bars), Colorado had Ds (see picture) but EPE 5-10 meter. Both units was WAAS/Egnos enabled, no compass, max backlight, fresh batteries, showing the satellite screen and so on. The terrain is a perfectly flat open field with very good satellite reception. My Colorado (serial: 169006xxx) is bought in Sweden and use the beta software 2.51 and shows more or less the same problems that other has described in the forum.
The result: