E38 Survey Solutions has an article on their website about a test they did using Emlid Reach RS2 vs. Topcon Hiper VR that Emlid users might find interesting. Some of the quoted text below and link to the full article also.
"RTK GNSS Accuracy Test: Emlid Reach RS2 vs. Topcon Hiper VR
by Kali Fencl November 12, 2020
The intent of this study is to determine whether there are comparable accuracy results between the Emlid Reach RS2 and Topcon’s newest receiver, the Hiper VR. Jim Knuckey, PE, with 46 years of experience in surveying and construction (including 15 years in GPS and Machine Control) conducted this study.
Using RTK, the Reach RS2 with ReachView 3 and the Reach RS2 with FieldGenius for Android (both collected on the E38 Vivid Tablet), were on par with the Topcon Hiper VR running Pocket 3D on an FC500. All GNSS data was compared to data collected using a robotic total station. Table 1 displays the root mean square error for each receiver.
Based on this study, the Emlid Reach RS2 with Reachview 3 as well as with FieldGenius for Android, provide comparable accuracy to that of the Topcon Hiper VR across a variety of different environmental conditions in both RTK and when processed using OPUS."