[Lonman]

Depends on your needs and future plans. If this is just for a small room, it may be all you need. If you want to use it in larger rooms or outside, it's going to be pretty small and thin sounding.

The feedback suppressor built in is only going to be good as your initial gain structure, speaker placement & mic techniques. You have a good solid setup with these last 3, you shouldn't get feedback anyway.
You can always add a nice eq later (my preference over a feedback eliminator - which you can also add later if you want). I am also not big on the 1 knob overall system eq. That reminds me of the tone control on an AM radio.
If it were me, the board I mentioned and a couple decent speakers are going to run about the same (maybe a little more) than that Stagepass.