The American Eagle Food Machinery® 40 quart planetary mixer is a sturdy, quality machine. According to the manufacturer spec sheet, the transmission is capable of 3 speeds (152 RPM, 313 RPM, 573 RPM). We don't recommend the high speed RPM for heavy dough. You will need to adjust batch sizes to use less flour for doughs with less than 60% water absorption. In our unofficial tests, we're happy to report that the transmission holds up to abuse. That said, since this voids the warranty and you might have to pay for an expensive service call within a year or two, stop the mixer before changing gears. The safety guard automatically shuts off the machine when opened and is required to be closed before you can turn the machine on. The machine also comes with an automatic 15 minute analog timer or a 30 minute digital timer. Unlike the 20 quart and 30 quart mixers, we find that this mixer does not perform well at the standard 115V. The manufacturer rates the machine at 220V. You may need to check your kitchen and determine if this is available. When installing, you will need to ensure that you have the proper electrical connections, we highly recommend finding a professional electrician to install and make the power connections. American Eagle Food Machinery® offers some nice adapter kits on special order also such as a 40 to 20 quart reduction kit which allow you to mix smaller batches than the default 40 quart but without needing to purchase a separate 20 quart mixer. The machine comes standard with a bowl holder, stainless steel bowl and stainless steel wire whip, aluminum flat beater, and aluminum dough hook which all are very high quality pieces and should last a long time. You may want to consider ordering multiple bowls and trucks (which we have as regular stock) to take full advantage of the machine's high productivity, this will allow you to swap out batches of dough without cleaning out the first bowl.