I've sold WHFRP + all major expansions and planning to start Pathfinder D&D campaign instead. Why? 4 years with WHFRP have been fun but the fun-factor with the custom dice and cards has changed into burden of carrying a big box of stuff which needs to be accessible at all times when either planning or playing. Also, the player tendency started to be about using each players' special action cards in every encounter - the cards on the table defined you as a character too much. Yes, it's a playstyle issue but still, I wanted to go back to the roots of pen and paper RPG. Also, easy accessability of PDF these days cannot be overlooked. So for main part, this a medium and accessability reason.
Partly why I'm not keen to play WHFRP anymore is due to rule issues which are difficult to house rule as the cards are too much build around the core system as it is. There's no way changing fatigue / stress system for example as cards rely on it working as it is.
My house rule set has been very successful with my group and I leave it to you, playtested and all:
In my house rules, I've touched player combat turn, monster ACE, critical wounds, new idea of corruption, death and healing etc