I own both a Stratosphere hooped bivvy and a Dutch Army Issue Hooped Bivvy (sad I know).
There is no contest.
The Stratospehere has let rain and moisture in on me twice in copious amounts. The material is flimsy and will pluck and rip on any thorns or the like in the field. A good idea but save it for your kids in the summer.
The Dutch Army DPM Hooped Bivvy is the best bit of kit I have used in a long time.
The material is durable and hard wearing.
Condensation is not an issue as you have a brilliant mosquito net built in and the ability to hang a small light from the zip ends or toggles that hold open the flap by your head, should you choose to keep it open.
I especially liked the material sewn in on the underside, to keep your issue foam roll mat in place. This protects the bivvy and the whole lot can be rolled in a oner, in a "bug out" situation.
There is room for an air bed inside (if you are really travelling first class!) and I can easily fit my rifle and assault vest in on exercise. Therefore, a small pack near your feet is easily accommodated instead.
The whole bivvy uses about six pegs and I have used it in a barn on a concrete floor with no support. The hoop remained free standing and gave me room to read without a problem. The system packs into it's own very durable bag with ease and is no real weight.
In conclusion, buy the dutch rig. It is a fraction of the cost of what it should be and I am the envy of the Unit in the field.
Good luck
pete