Perhaps others seeking information will not be so frustrated at not finding out basic info or be told useless garbage info from forum users..............
1) #SSID per radio is not limited as far as I know. (I had 20 of them once, just for fun...) However, more SSIDs = more time required for beacons = less time for actual communication = less total throughput. That is simple math applicable for every device.
2) #VLAN per radio is ambiguous question - If you talk about physical radio, then question is irrelevant. One radio can host one or more interfaces (you call those SSIDs). VLANs are always related to interface, not to actual physical radio. Interface is usually set up as either trunk or edge. If it is trunk, limit is 4095 (practically unlimited). If it is edge, it is usually exactly 1 VLAN (well, could be more with specific settings but that is not the point I guess)
I guess you are trying to understand if 1 physical radio can have multiple SSIDs, where each SSID has its own VLAN ID. In that case answer is yes - practically unlimited amount of SSIDs, each with own VLAN ID can be set up. This is Mikrotik. Not some consumer-grade toy
3) bronchure should not state things like "2.4=450Mbps". That is oversimplified and imprecise statement.
It is important to understand that setting up Mikrotik devices requires some technical knowledge, same as Cisco or Juniper. I mean absolutely no disrespect, but from your questions I feel you are not an IT guy. Even as a big fan of Mikrotik, I must support your decision to buy some more simple device. Using complicated devices without proper skill may lead to frustration. Frustration leads to anger, anger leads to hate and before you realize, you will join the dark side.