I've owned this stand for almost a year and have used it multiple times a week so far.
quality- the stand is very sturdy and is made of steel. the height can be customized at no extra charge. I required an 8ft model to ensure the bag was at the right height for me. I used 8 of the sand bags and there is no movement in the stand even when using the prolast XL 150lb bag on one end.
speed bag platform- the platform is thick enough to give a great rebound and the set comes with a high quality swivel. The original platform was damaged during delivery, but prolast got me a replacement at no extra charge. I did place a small sand bag on the top of the platform to remove any vibration.
sand bags- these have held up so far and. I do recommend 8 if you have two large heavy bags on the set.
overall I have been very happy with this purchase and the item is very high quality and provides me with a great boxing workout at home.