Nothing wrong with the earlier '70s Sansui speakers, or the SP-L series which seems to be quite fine actually. People knock them all the time. Who cares.
I really like my SP-2000s. Sure fills the house up with great sounds. Just sounds 'really good' really. How much more 'really good' does it have to sound? Like JBL really good?
I mean, like when they are playing...I never hear the speakers, I just hear the music. And it's 'life-like', I wonder why? (That's a 'hint' for folks who don't know why.)
Gaudy and cheap?
I really like the 'furnature look' of the cabs and the wooden grills. Gaudy? I guess if you don't like the look, then maybe it would be, but wooden furnature never bothered me. I mean... it's a style of 43 years ago granted, but it does look nice! Actually it sounds like the stereo is coming out of the furnature! haha. Not really. The cabinets are 'super heavy' (pick one up sometime), very well constructed, and stable as a rock. You can crank the music and the cabs are rock solid. It's just the fronts, that the speakers are actually mounted in, that could of been made to look 'finer' for the folks that take the grills off. Yes, absolutely, there's no doubt about that...But during the day, when they were made, folks 'always kept the grills on'. Grills on was the 'style', unlike today. Other than that, nothing cheap about them. And the spkrs have AlNiCo magnets.

And yes, there is a difference in sound quality with AlNiCos. Accept it or not. Alnicos sound warm, PERSONAL...I.E. life-like.
In 1970 they were all the rage. Are they the best speakers out there today? No, of course, far from it. But then again...you can get a pair of really fine early Sansui's for $100 to $200 that cost $1000...in 1970! Cheap? No...I don't think so.
With all the knocking of Sansui speakers...they do sound pretty darn good!! (and life-like: another hint!)
Maybe you will need to buy new capacitors for the crossovers. That's normal. I mean, they are fourty three years old. That's like 161 years old in people years. lol.
Give em a break!! LOL 
Just rebuild the crossovers. Got a bad speaker? Get a used one off eBay, or just buy an extra pair of the same model speakers and you have a ton of spare parts! * Pretty simple really *.
Or go buy a brand new pair of Cherwin Vegas for $750+ that last 3 to 4 years before the surrounds rot out. Or you can spend $2000+ for a really nice pair of 'new' speakers, with ferrite, or however you spell it, magnets. Cold as ice! Maybe not quite THAT cold.
Guess it all depends on what you want.
My wife has a 'new' pair of $700 speakers, not the Cerwin Vegas mentioned above, for her new stereo in the family room, it's what she wanted, so it's ok. The $700 speakers sound 'ok' for movies, but that's it.
The SP-2000s just blow-them-away and walk all over them in the sound quality department. Also, she wanted new $300 BOSE speakers for the bedroom.
Truth: My $9.98 AS-100s blow them away. Totally out of the water.
So...you tell me.