Doing a bit of a punt i work for an outdoor store that may be a warehouse as well.
I have done many ppls upgrades and dont c any reason why u would not want to upgrade, as mentioned above it is a simple process that just requires the R50 dvd and then following the instructiuons.
Used the new maps in Crystal Faires last race and found them helpful.
Topo maps would be perfecty for caching but do require extra moola. I have not seen the new Topo and road maps but TeamTGF told me that it was not a huge amount above the Normal 1.5 maps
Any more assistance most stores should be able to help, some will even do it for u and load firmware updates and speed cams as well, hope this helps.
Or if ur tech savy DIY