Smart trainer

Just got my power meter which I am using with zwift which is brilliant.
I am using it on a basic cycle ops mag trainer and was thinking of getting a smart trainer to replicate the climbs on the trainer but looking into into it do you thinks its worth getting one to replicate the downslopes aswell.
The reason I'm asking is because theres a bit of a price difference between the ones that just replicate climbs compared to the ones that replicate both the uphill and downhill's.
I am using it on a basic cycle ops mag trainer and was thinking of getting a smart trainer to replicate the climbs on the trainer but looking into into it do you thinks its worth getting one to replicate the downslopes aswell.
The reason I'm asking is because theres a bit of a price difference between the ones that just replicate climbs compared to the ones that replicate both the uphill and downhill's.
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But it's one of those things that's a nice addition not at all vital.