If SNB will remove the floor, it most probably will be a HUGE jump down with all grids wiped-out. Most probably it will be on weekend, so technically U can do nothing and may be even go negative of your total account, depending on your broker. This will happen sooner or later. Guaranteed. Only question is how much money U can made before and this has something with gambling.
I see various EUR/CHF grids are becoming more and more popular in the retail trading, especially since EUR/USD break-outs are not performing good last half year and many traders see EUR/CHF grids as next "holy-grail". Which is one of signs of quick future strategy death. For me personally I don't believe in "holy-grails" in fx and don't want to go with the crowd - just because many times U are simply already late. Like in any pyramid those who are first early birds they benefit the most, others are wiped out.
On the other side there is no signs yet that SNB will change its policy in near future....
Pure fundamental - go get it