I've seen Faimba in service and it's not disappointed otherwise my life would have been unbearable.
I've seen Zuku in action and it sux. Today I was at a friend's office. They have Zuku and pay 5800 pm or something like that. I ran a speedtest between them and safaricom -
speedtest.safaricombusiness.co.ke and it was 20Mbps/2Mbps but downloading a 40MB file took hours. I had to cancel it and rely on the same file from my portable disk in a situation I'd thought would get the file down in a flash!
I haven't used Orange that much, apart from on the modem.