I'm 3 years in on my Speedster and have hundreds of miles - I think they are both 700C so assuming the cassettes match, I think wheels were not a problem.
My Speedster has seen better days - I've wiped out at least once so my gear shifters are quite scuffed up and missing the clear covers. I went into it thinking of just focusing on the disc brakes, but I think overall speed and upgraded drivetrain are what I'd be getting.
It also seems like the Legand brand is road-only and given I'm not a race guy, it seems the RT-1000 is more of an endurance ride.
Links to the two I'm contemplating: https://www.amazon.com/gp/product/B006CQTBBU/ref=s9_acsd_simh_hd_bw_bEHqb_c_x_3_w?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=merchandised-search-3&pf_rd_r=JREE40KW4TENCX99V44Y&pf_rd_t=101&pf_rd_p=02fa4d22-e0d1-5b78-8d76-8d1c5ae54637&pf_rd_i=3405201&th=1&psc=1