Just thought I'd share my experience with Sharedband

My company were using Sharedband through Eclipse a few years ago - we actually had 4 Sharedband ADSL2+ lines and were getting speeds of 60 Mbps down and 3 up on a good day.
In that particular location, it worked well without too many service interruptions.

Eventually we moved premises, not too far but on a different exchange (FTTC enabled, but since it's an industrial estate, cabinets are not due to be upgraded) - we opted for 4 new lines and the same product but in this location is was much more unreliable, quite often we'd notice that only 2 of the connections were "bonded". It ended up becoming so unreliable we decided to get an additional line from Plusnet with Annex.M enabled, solely so we could make VoIP connections without quality issues.
I'm not sure why the reliability changed, we eventually ditched it and moved to Virgin Media Business (Which was another saga in itself).

I don't know if Sharedband has changed since we used it, but with 4 lines we required 8 routers for this configuration (2 per line), so you do need to consider the amount of extra space (not to mention power and cabling) it takes up.