Adam,
Google ATSOCAS (Air Traffic Services Outside Controlled Airspace) for a full version of what I'm about to say, but...
Basic Service is fundamentally the pressure, runway in use, possible servicability or system outages, but that is it. No radar needed to provide a basic service. If the unit has a radar, they MAY provide infringement avoidance heading/heights for you.
Traffic Service can only be provided by a radar unit. It will provide a basic service level with additional information about possible conflicting traffic. It will not provide any avoiding action from conflicting traffic.
Deconfliction service provides a traffic service with resolution vector which you should follow. Obviously, this can only be provided by a radar unit.
A procedural service, the foutrth option for ATSOCAS, is based on procedures and reports from participating aircraft and also does not require a radar unit but does require published procedures.
When you call inbound the controller would normally inform you that they were providing only a basic service, regardless of whether you asked for one or not, so that there was no possibility of you thinking they were providing you with any other form of service. If your joining somewhere with a radar unit you could ask for an upgrade to a traffic/deconfliction service if you wish for that extra level of comfort.
The fact that you do sideways chandelles, lazy eights, cubans or whatever on final will have no effect on the provision of a basic service, but would effct a traffic or deconfliction service as you're changing heading/level would need to be co-ordinated with ATC.
HTH
Duchess