You need to check connection speeds but all the numbers you shared are possible. The 1MB speed was common in 802.11b days.
I just bought the Buffalo Linkstation Live, and have it installed with my 2wire router/modem combo. When I copy a bunch of files to it, Windows tells me that I am writing at about 1 MB/sec (capital B). This isn't too bad, and the read speed seems to be very good, but my friend has a Western Digital NAS that is doing 35 MB/sec. Anybody know where I should poke around to improve read/write speed? I'm connecting to it wirelessly, but so was he.. Thanks a ton, Brian