The springs hanging from these attachments provide friction and balance control. If the optical tube becomes top-heavy, you will have to use additional weight attachments or increase the friction. While they are functional, the friction-adjusters on the Zhumell Z8 are much better as they are movable along the optical tube, thus eliminating the need for additional weights.
The base is particle board. It is not easy to carry as it weighs around 21 lbs (9.7 kg). The optical tube is heavy as well, coming around 20 lbs (9.1 kg). It is always an effort to move this telescope, but considering the amount of optical power a Dobsonian provides, this is an acceptable sacrifice.
If you are concerned about being able to fit the telescope in the back of your car or your trunk, it is possible. After you detach the optical tube, things become easier.