I'm 51 years old now, when I was much younger I fought in open points style tournaments against every possible style that existed in the 70's and 80's. Then I got a serious beat down by a short but powerful and lightning fast WTF/Kukkiwon/Jidokwan Korean master who spoke no English. My days of mish mash style dabbling was over.
Years later, after getting use to the local Taekwondo scene I was fortunate enough to get out of my state and see the national Taekwondo scene and learn a lot more, then I got involved in the International Taekwondo scene. After experiencing Taekwondo on an international level for many years, nothing else can even come close.
As far as competition goes, I think it falls into "whatever floats your boat". Remember, this is supposed to be FUN.. otherwise why do it?
For me, open competition was fun. I enjoyed testing myself against other styles.. it was sort of like a chess match.
But that's not for everyone. Some - many enjoy the Olympic style, and as long as they're having fun, and it floats their boat, I say "good for them".
I think any sort of competition enhances your abilities, broadens your scope, and builds your character. So it's all good in my view.
ralphmcpherson: I think its healthy to spar people who train a different art or spar using a different ruleset. I mean, if you know leg kicks arent allowed, for instance, then you know not to expect one, so why bother learning to defend one. As Ive said before, cricketers dont bother practicing against underarm bowling because they know they will never be called upon to face an underarm bowler because its not within the rules. Same goes for MA, a ruleset can become so refined that it changes the way you fight. I have often asked tkdists why they dont use a certain tech when they spar and they say "because it wont score".
Back in about 1986 I was traveling a lot for business (my day job). Several trips took me to Italy, and over the course of time I made friends there and ended up training in a Karate School in the town of Biella (sort of north of Torino).
While there, a tournament came along, and I thought "why not?" and entered. The tournaments were mostly all Shotokan guys - but it was frigging HUGE. This was a local tournament, yet the scale was beyond a national competition held here in the states. I think they have fewer tournaments, so for the ones they have, the attendance is higher.
Anyway, in just my division there was well over 100 competitors.. probably closer to 200. The competition lasted over 2 days. I made it into the second day but got injured and had to drop out.
The way I got injured speaks to ralphmcpherson's quote above.
In US competition, an inside sweep to the leg / knee is not allowed (due to the high injury rate I think). Anyway, I knew this (first thing to do when you go into a open tournament is learn the rules), and was prepared. What I was doing was floating my lead leg (the leg they were more likely to sweep), letting the sweep take it up - then I would fold my knee and deliver a quick lead leg (the leg that was sweeped) round kick to their head followed by some strong punches to their upper torso. This was working well...
Until..
I got caught flat footed with my weight on that leg. I was tired, beat up, etc. This was the second day of constant competition, and I was pretty much head to toe bruises and sore muscles. My body was depleted and I was exhausted.
Anyway my opponent came in with a really strong / fast rear leg sweep to the inside of my left front leg. My foot stayed on the floor and my knee gave way. Major dislocation of my knee... while I was standing with all my weight on it.
Man that hurt.
Anyway - I got to experience socialized medicine in Italy.. and knee surgery when I got back to the states.
The thing is, this was a rule I wasn't used to. In spite of my injury, I believe this was a good experience for me as a martial artist. I learned a lot. Expanded my horizons.
Up until then I was having fun.. the way tournaments are supposed to be. I was meeting new people - talking to them, learning from them, and sharing experiences. For me, that's what competition is all about.
The dislocation... not so much fun though.