Yes It's a Sony and for these reasons. . !

I find people wondering why not Canon or Nikon and I say: "Yes, its a Sony ! And that is what I wanted"

My use case is mostly bird photography out door usually in good light and stay low budget going forward with additional lenses. So I shortlisted Tamron 70-300 DiLD Macro (A17) and Tamron 200-500 (A08) before buying A58.

I wanted 

1. In body image stabilization (should work on cheap lens hand holding is 80% with birds, it works on prime lenses too)
2. Extra mpx for cropping. (more than 16 or 18 from competition)
3. Faster viewfinder focusing.

Build quality compromise was known.

I got what I paid for hence I am happy.

Some bonus

After using there are some bonus points I could identify and use

1. Focus magnification when using viewfinder.
2. Focus peaking in viewfinder.
3. No need for mirror lockup function.
4. AF tracking which is not very usual in entry level camera.
5. Tethering remote control from PC.

As compared to

Two camera competed in my budget Nikon D3200 and Canon 600D

Canon 600D offer of twin kit 55-250 lens was the real juicy but then I am at
18mpx and 250mm and with A58 I am 20mpx and 300mm.

Nikon D3200 only scored on 24mpx. Adding VR lens would put it out of my  budget. There is again AF motor related issue.

Am I happy ? Check my birds pics in first 15 days.