i have a nexus and use it on both wind and t-mobile (switch sim at the border)
the dropped calls and lack of coverage were bad but are quickly getting better depending on your area. calgary is much better than a week ago, surry is working great but in delta bc i cant seem to hold a call longer than a few min. the signal isnt always the greatest but it seems that wind is getting better quickly and the problems are more related to it being a new company. for the wifi, my brother bought the one for rogers and he does get a stronger signal. one bad part that i havnt noticed any improvement on yet is that i have been very disappointed on the 3G data connection with wind. seems to reset every few min preventing IM and files from downloading. not sure if its just not working yet, or if its intentional to save bandwidth from people tethering. i am using the wifi hotspot in froyo to type this on my laptop right now and works great, just cant stream any video, and any media on the phone, or anything that needs constant internet like IM programs just dont really work