I personally own one (2 years now) and I owned the prior model with the rails over/under. My company owns 4 for the field installers & 8 are part of the indoor millwork shop supplement I have heard complaints about the unit moving too much left-to-right at full extension (or 'draw') and have compared it to all our other sliding miter saws (milwalkee, hitachi, festool kapex) and have noticed they all 'move' the same amount I have also heard this complaint about the 'gritty-ness' on the slide action, I have only noticed this when there is exceptional amount of sawdust/debris that accumulates on the saw itself the most common products we cut (ultra high end finish work only) are: pre-finished hardwoods, hardwoods, poplar, veneers, finish plywood as for my company, it is well known that the blade is 50% of the saw's performance, as it's the only thing making contact with your product (like tires to a car). considering our materials, a 100 tooth H-ATB (between 0 -to- 10 degree) thin kerf blade or a ATB-R will perform flawlessly. typically, tenryu brand is preferred, then Dewalt (good luck finding their AWESOME 100 tooth ATB-R blades), finally Frued... since my company would never consider buying a Forrest blade for their cost. some of the Pro's/Con's for why we chose and continue to use them: Pro's - light weight, though 56 lbs is heavy, it's one of the more lighter 12" sliders available considering it's size - minimal maintenance, we re-square/align the miter saws and table saws about once every 3-4 months, the Dewalt dws780 models are often the ones that do not require any adjustment or if they do, it's the fastest and easiest ones to do so - they are the most compact when fully collapsed, for transport turning them full right (60 degrees), with the head locked down and slide at it full forward... these take up the least amount of space or any of our other 12" models - largest cutting capacity: if you haven't checked yet, it has the largest cutting capacities of all the ones we use, extremely handy when needing quick cuts for making jigs then switching to large 6 1/2" crown then back again - then light, never thought I would like it, now I struggle when I cant have it con's: - it takes about 36" from wall to tip of the mitre locking handle to the rail pushed furthest back to fully operate properly & comfortably @ 90 degree cuts (with dust bag), so if you want to set it up in a hallway that's 42" wide... think again, or else I hope you're a wirey fellow - it's a belt drive motor, so if you are using a not-so-good brand blade or a dull one, you may have to get the motor to full speed before you make your cut(s) to achieve decent results - ...it's a 12" saw, a lot of deflection can occur if you force it... again, the blade makes all the difference FYI, I have never met any one who owns one or uses one and says, "this thing stinks" good luck