I was using an FFB Pro (i.e. version one) up until I got my FFBeast going this week. They are still great, but the effects aren't very strong, particularly if you want to use an extension (or stick a heavy ass Warthog grip on it as I did).
The centre deadzone is more likely to be from wearing out rather than endemic. The wearing out is also more likely in the FFB2 than the original (given the original uses optical encoder rather than potentiometers. Unfortunately the resistor mod doesn't apply to the original version, so if you want a heavier grip or extension then FFB2 is better for you.
Other things to note, the majority of original FFB Pro don't support USB (the last year or so of their production they did and came with an adapter in the box, so you'll need to convert it yourself if you do go that route.