"edit - sorry my iphone bunched my post up!"
Hi
Having the keyword in the URL is helpful in a number of ways;
1.) relevancy to the page
2.) branding
3.) easy of navigation (user experience)
4.) categorisation
It would be far better to include the keyword in the URL for the above reasons but also for future development of ur site.
For example, how would you target the title, page content, alt tags, images, technical info, metadata etc for search engines once you have say 5 different types of tablets? Rather than using ur short URL where all the products are competiting on the same page for rankings it would be much better for each to have a seperate page on ur website.
This will help you not only build targeted, keyword rich, relevant and helpful pages that have seperate rankings but will help to improve your conversion to sale & help lower bounce rates as you customers will land on a page of products they have searched for, as opposed to searching through a page of similar products for what they want.
Hope this helps but I can expand on this if you need!