The CZ/Huglu O/U's generally work well for skeet/SC's and can be used for trap, but you'll have to adjust accordingly in trap to account for the rising targets. I used a Redhead with 28" barrels for my first year of sporting games and shot quite a bit of trap with it.
You'll probably want to purchase a decent recoil pad for it as well, as the stock ones on the Redhead are terrible and the gun will generally rattle your head otherwise. I can't explain it, but my CZ Evolution (.22lr) has a much nicer recoil pad than my CZ Redhead in 12 gauge. If you're in the field and only shooting periodically, that's fine, but if you run up an afternoon of hundreds of clays, you will be longing for a softer-shooting gun.
Generally, if looking for a dedicated entry-level trap gun (and not something that can play all the sporting games), I'd really look into a BT-99. They're purpose-built trap guns and you really get a lot of gun for the money, especially if you find one slightly used.
