I have been running various updates and latest maps for years , all very successfully.
Went away recently and found my GO 930 running quite slowly, not just moving between pages but following the road changes. There seems to be spare RAM according to the version info (8.4Mb free).
9.150.554646.2, OS 541764 (4002, 21/7/2010)
64MB RAM (8.4 free)GPS v1.20, Boot 5.5274
Europe 870.3460