Nothing wrong with an Improved Clinch knot, most important thing is just make sure its wet when you go to snug it up. One other thing to consider is the Improved Clinch knot does not do as well when you get into the heavier line weights 20b and up. So you may want to consider a Palomar knot if your line diameter is getting up there above 20lbs give or take. I think Berkley says they don't recommend a Improved clinch on mono over 30lbs.
Most of the time I attach my leaders with a very small barrel swivel. Attaching the braid with a Palomar knot, and the 8-10 lb Fluorocarbon with an improved Clinch. I willing admit that I am always checking my leader and if I feel a nick replace it or trim if its near the bait. If your not going to be cautious about reeling a swivel into your eye lets which can cause damage then attach leader with double Uni.
for 99% of my fishing, I am tying one of three knots, Improved Clinch, Palomar, or Uni or double Uni knots.
There was a comment about tying their braid direct when the water is dirty, and I tend to agree to a certain extent. Case in point. During a recent fishing trip in NW Ontario my brother was tying his jig direct to his braid, I was using the fluorocarbon leader. I would say we were pretty much head to head with fish caught, I may of been up a few on him over the course of a couple days. Then a cold front went through, and all of a sudden I was out catching 5 to 1 easily and he was getting frustrated. I suggested to try a Fluro leader which by this point he was ready to try anything and bang, and soon as the leader was on he was back in the game.