Lenovo is the world's largest PC vendor and is a continuation of IBM's PC department after they bought it out.
In the laptop/notebook segment they're first or second, in the corporate world alone their ThinkPad and X1 Carbon models probably have the biggest market share (if not, a massive slice).
Surprised you haven't run into more owners ...
But in any case, you can't typecast a brand with much, as build quality and general performance differs greatly between models and different price points. Apple and Microsoft are the obvious exemptions to that, as they work within certain price points and deliver a known level of quality at that level.
Acer for example is hit and miss, more so since having taken over Gateway in the budget segment of the market. ASUS is generally cheap Taiwanese/Chinese shit with terrible aftermarket support, but from time to time come up with products that push the boundaries of the price point they sit in such as the recent Zenbooks
. Dell offer good aftermarket support, aiming for the small-medium business segment.
But, if you know what you're looking for, laptops of a similar level of quality & performance, tend to sit within a similar price bracket. Sometimes you find one sits a bracket below, but then you have some small things to consider (i.e., the aforementioned Zenbook doesn't seem to have the build quality of a MacBook Pro or Dell XPS, but undercuts them both on price).