Unfortunately the few towers they have in their 'home zones' (where you are blocked from roaming to Telus or other partners) are so overloaded they are often unusable. I have been experiencing extremely low or non-existent data rates even with full bar signals. Text messages often have to be sent several times and some are just not received at all.
Bottom line, is that Wind keeps advertising and promoting to get more customers, but are not in-filling their existing network to accommodate the attendant increase in traffic growth.
This will surely come back to haunt them as the churn rate of frustrated users increases and the word gets out.