I dont know much about the Y series.
I bought a Lenovo T series 3 years ago and works very well. It is very solid and never had a problem with it. I keep it on almost 24x7.
I like Lenovo's keyboard but when i use the docking station I use a this keyboard , http://www.kinesis-ergo.com/freestyle.htm.
Its an awesome keyboard and i have been thru many logitech and microsoft natural and less than natural keyboards until i found this one.

V.