I have studied, researched and looked far and wide at multiple options and then I discovered this system.On a line of one to ten, I rate this a full ten. It was the perfect choice for my application where I required precision movement for sake of accuracy for making large timber cuts with my electric chain saw. It solved my problem with the utmost satisfaction. As for load bearing capacity with four carriage blocks the weight distribution is excellent for guiding the chainsaw and bar for making plunge cuts. With a secondary horizontal linear rail system it guides the horizontal cut making for a superb cut. Highly recommend the quality that was put into this system. I purchased the metric bolts from ACE HARDWARE and was amazed at the ease and precision the bolts inserted so well. The quality of the carriage blocks are what you would expect. The stainless steel rails allow the carriage to glide with ease.Highly recommend. Hope this helps.