Shark Cordless Vacuum Cleaner - Clean Sense IQ

I really wanted to like this vacuum because I have been using shark products for years and loved them, but not this vacuum. The faults don't lie in its power, suction or the multi roller head, all those are great. Where this vacuum suffers is in it's build quality, clean sense feature, battery and competition. First it has a feature where it folds in half for easy storage and under furniture cleaning but when it's locked in it's normal upright position, the joint wobbles and isn't very tight giving you a feeling of cheapness. Second is the clean sense feature, this was so close to being a good way to prolong battery life that if they just tweaked it a little it would be good. The problem is it fluctuates the vacuums speed to rapidly, that's not a problem on hardwood floors, but on carpet, it is a big problem when the speed of the rollers determines the easiness of pushing the vacuum through carpet. So what you're left with is when you try to vacuum your rug the vacuums speed will go up and down so fast it will be easy to push then hard as heck. I think if they just add a 5 or 10 second delay before the motor chose to ramp up or down it would be a nicer to use feature. Third is the battery, while most battery operated vacuums offer one battery with the vacuum they at least sell the battery separately so you can have two and swap, Shark does not. To make it worse the other model of battery powered vacuum they sell even has a kit with two batteries included, so they know there is demand for it. Also I have only had mine for a month and the battery won't charge above 70% for some reason. I'll leave it on the charger for 48 hours, go to vacuum and the screen will show 70% charge, I'll get 3~5min out of it and will just die, sometimes I'll take it off the charger saying 70% and it will last 10~12min. Fourth and final is competition, they have a lot. Yes Dyson is not really the competition because they are more expensive, but not as far off as you would think. I am more referring to LG, Samsung and Tineco. The lg and Samsung offers a docking station that allows the vacuum to charge without using a little cord and barrel plug, all three companies offer a packaged optioned with 2 batteries, and they sell the battery by itself as well. All three have similar options in the same price family.