To be clear 'support' means different things to different people. Support as in 'we'll give you the u/p so you can install your own hardware' is quite different to 'if you have a fault we'll help you with your hardware and be trained on it'. You're still likely to run into the classic 'put the SR102 back in, does it work? OK it's your equipment, thanks bye.'
As to the point about a 'dedicated' support team you'll usually find that they have call groups, the fiber team itself is a dedicated support team, training senior frontline staff up and putting them in a call group where by they land the pro calls when they come in or the normal calls when they don't is in effect the same team, but it makes it seem like your £10-20 extra (who pays RRP for Sky?) is getting you more than a u/p. If the potential extra upload and under 1.9MB/s is worth the extra to you is your call, but go into it with your eyes open - also deals on Pro are a lot harder to negotiate.