I bought the SPARC II a few months back.
It is mounted on a 16" AR15.
It has been hauled back & forth to lease several times with about 200 rounds through it.
No problems with it.
I have also had an EOTech for many years, which I really really like.
If you are looking for a less expensive Dot, you should be happy with the Vortex.
I have no complaints.
However, it is not an EOTech.