Not the newest platform - that is for the Siya’s and the OPN’s, but still it is a updated platform compared to the current common NHS aids. So they are “legacy” but the newest “legacy” available.
Normally NHS aids are probably what you would consider “mid-range”. But the Synergy Sense is a bit of a break from that. When I compared detailed specs I remember them coming out as “high-end”. To be completely fair I think Oticon had 2 entry level, 2 mid and 2 premium. Its nearest match was the lower of the two premium hearing aids.
Any of the top manufacturers newest high-end high street hearing aids should be a step up. But they are still good units. I think of them the same way I think of iPhones - the iPhone6S or iPhone7 range aren’t the best available, but they are still very capable and getting those for free would still be brilliant! 
All have 16channels, 10 fitting bands and up to 5 YouMatic profiles. Software features are as mentioned in those links above. The mini-BTE are “85dB” units and have a bandwidth of 100->8500Hz (Ear Simulator) and 100->7500Hk (2CC Coupler). THD is <2%. The full size BTE in its 85dB version has marginally wider/better bandwidth.
It does NOT have direct bluetooth, and none of that family do. Instead it continues with the older tech of linking to a ConnectLine unit which in turn uses bluetooth to connect to phones etc. Nor is there inbuilt capability to be rechargeable.
They are however very capable for lots of potential users.
Me? - I have a very unusual audiogram and I didn’t get on with things like the anti-feedback or most of the fancy compression based software features like SpeechguardE, but I never do… so its not a criticism at all. Once the fittings and settings were set up properly for me they have been really good.