Every user has a different preference, and the reviews of users have given for different series are from their using experience. For using, and according the average review rating, SL series models are rated the best; and some hot selling models in the market are ThinkPad T400, Lenovo Idea Pad Y550, T61, x61s, x200. One usually gives review or rating for a laptop or computer usually depends on the observation from the performance of these factors that are life-long of battery, the memory capacity, how large is the screen, video and audio quality, any available additional plug to other electronic devices and usb ports.
The mentioned laptops above are all in new models with good rating and performance plus attractive design; however, their storage memory can be different. Laptop is one the big change in the history of technology because of the convenience in portability and mobility as one can carry the entire work document in a little small machine wherever he wants to. The picture of printing all the document papers for showing to business partners like thirty years ago is over, laptop makes it easier to store as much as data you want and bring it to any business meeting without worrying about the inconvenience.
Buying a laptop is like shopping for a bag, you want to consider if you are going to carry a lot of things to choose a big or small bag and how the bag's style fits your taste; as same as laptop, determine if you are about to store much data later, you may want to consider to buy a laptop with large storage capacity and which model with the design you like best.
Lastly, you may can find a laptop have all conditions you need, but budget is sometimes still a problem; therefore, sort out all the laptop models have the features you like and are within your budget limit, then you will eventually find the best ThinkPad laptop that you really want.