I have not heard the 7's but I did own a set of the SAM's and was very impressed with how well they did much of the sound scape. Best soundstage in any speaker I've ever owned by a good margin. good over all balance with just a hint of typical single driver/wizzer honk but very min. overall a nice speakers if matched with good electronics, definitely low powered tube amps are excellent with them.
they need a sub to fill out the bottom end/lower midrange.
the 7's are not offered anymore 9from what i can see) so i cannot comment directly on them but there is not many bad reviews of omegas out there so that tells you something.