When we reviewed the BlackBerry Bold 9700, we commented about the boring nature of the contacts. Alas, RIM has not seen fit to overhaul this particular part of the operating system.
To be fair, there's little functionally wrong with what's here, so we're not going to hold it against the Bold 9780, but we would politely request someone at RIM take a good hard look at the rather excellent People hub on Windows Phone 7 handsets, such as the HTC Trophy and Samsung Omnia 7, and then give their own some thought.
Boring list aside, entering a contact presents you with all the information you could really need. A selection of contact info you might have entered is presented simply, and is accessible. Scroll over phone numbers and press the select key to call them, move to an email address and you'll create an email, and so on.
Adding a new contact brings up the usual name and number options, along with the expected email and address fields. Birthday and Notes options are also standard, but the ability to create custom fields could be potentially handy. There is also, of course, an option to enter the contact's BlackBerry PIN.
Call quality was perfectly good, with a nice strong signal. It wasn't the best we've heard, but the other person's voice could be understood clearly. The external speaker is impressively loud, so letting multiple people hear a call is no problem.
Of course, making a call is rather dependent on having a signal. Our Bold 9780 on T-Mobile was totally useless in any known trouble spots, losing all signal when even an iPhone 3GS (on a different network, admittedly) was holding on to enough to make a call.
When we were clear and in a strong 3G signal, speed was generally good, and signal was maintained well enough, but it's clear that people out in the sticks are not top of RIM's list of priorities (for the record: we actually weren't out in the sticks. We were in the middle of a city, and still had signal woes).