One drawback to the Roomba is that you have to clean it much more than a regular vacuum. I usually have to a complete cleaning after doing the whole house. With practice, I can do this in less than 15 minutes (assuming I don't break anything). Here are some tips:

• The center wheel gets hair and other debris wrapped around its axle fairly easily. This makes the wheel harder to turn and greatly reduces battery life. I tried removing the wheel and seemed to have broken something inside wheel assembly so I don't recommend this approach (look for a repair entry soon). The best way I have found to clean it is with a good utility knife. Scrape the blade along the axle and up the wheel. This motion will get a lot of the debris out and you can use small needle-nose pliers to further extract it. With a few strokes, I can get the axle completely clean.


• The beater brush also gets hair wrapped around it. Simply remove the center screw and you can remove it for easy cleaning.


• iRobot offers a cleaning tool for $5.99. I bought it (along with some spare parts) but it doesn't really do much. The blade is good for cleaning the brush, but you can just use a letter opener or utility knife for that.

I have had my Roomba for over 6 months now which has given me enough time to give it a thorough shake down.
Overall, the machine works great. It is a great way to vacuum. It is especially nifty at getting under beds and cabinets that are difficult with a regular vacuum. We tend to use it much more than our old central vac.
There are some nits about the unit.
* It is quite loud. Not as loud as a regular vacuum, but you wouldn't want to run it if you need some peace and quiet.
* Cleaning it is a pain. All the spinning parts will have hair and pet fur wrapped around them after one or two runs. The main brush is easy to clean with a knife or a special cleaning tool, but the side brush and the center wheel are not designed to be easily removed, so they get really clogged up. In fact, the center wheel will become hard to turn, which probably reduces battery life. Also, the unit has lots of small parts that can get lost easily; so take care when disassembling it.
* Extension cords will bind it up. Since the unit can get into places you normally don't vacuum, make sure there aren't any extensions cords, yarn or other stuff that tends to hide under beds and cabinets. They will bring the robot to a screeching halt.

Since replacement parts are easy to come by, I intend to use my robot as much as possible. I have my eyes on the workshop model next.