STVLEE, the problem with "using Google" is that you most often don't get to the real facts.....
Here, on this forum which is the best place on the web, to ask and get honest answers on IWC watches you will get to know fact!
And I for one will tell you, that whilst not the most accurate watch in my collection, my 5001 runs fantastically well and is within 3-4 seconds a day now (for a watch that is now almost 4 years old with lots of wrist time)!
Others here, like Lucio who own watches with the same movement will tell you that his watch only lost 3 seconds in total after a whole month!
So, nothing wrong with the Portuguese 5001-xx and if you want style, class and a well finished movement that runs accurately at a modest price (compared to some of the other watches out there from other brands) then go ahead and realize your plans. You wont regret it.
Mechanical watches, are just that - mechanical, and if as you write you seek a "more perfection" from a pure time-keeping perspective, then possibly a quartz timepiece is for you or opt to spend upwards of 5-6 times the list price of the 5001 and buy some other mechanical timepiece. ... (oh by the way - even then, often those 100K plus timepieces don't do much better than a well regulated 5001 either).