To reinforce some of the points the previous posters have made:
When I bought a meter I was pretty nervous about how to use it and interpret the results. I needn't have been: They're easy to use and my manual (for an Accu-Chek Aviva) was easy to follow.
You'll need to record your results and there are various online programmes which you can use (in some cases they're free unless you want to upgrade to include more (IMO, not essential) bells-and-whistles).
The main point is that, without a meter you're working in the dark and I can't see why anyone with diabetes wouldn't be advised to get one.
1. Mine's allowed me to work out which foods badly affect my BG level and which don't - that's meant I could alter my diet and watch how that then helped my BG, which is quite a boost when you get it right.
2. Over the weeks, by looking at the results on my meter and comparing them with how I feel, I've developed an idea of whether my BG is going to be high, low, or changing rapidly, even before the meter confirms it. I think that's an invaluable instinct to acquire.
3. Finally, it's got my doctor thinking about what's causing my T2. Not all GPs are interested, I know, but I've actually got one the better ones who last week took the time to go through my results for the past 2 months and decided to send me off for a series of tests 'to see if there is anything more we should be doing'.