Older vs. newer REL subs

The good news is that my 3 REL subs from basically the same era, two Q150e 10" masterpieces (had one for years, just bought a second one) and one Q108MK2 8" all work beautifully and were bought used el cheapo. The bad news is that REL won’t service them. If one dies I would try to find somebody to fix it, but they’ve essentially paid for themselves relative to what new ones cost. In my home studio pile I have a 92lb beast Mackie HRS 120 (not a portable P.A. Mackie, this thing is far more adjustable) with a 12" woofer and 12" passive radiator and 400 or so A/B watts that goes down to 19hz...I found it at a used instrument shop for 200 bucks and I’m pretty sure they didn’t know how it worked...a lot of woof per dollar...I don’t think subs necessarily have to match as I’ve used the 150 and 108 together in my hifi rig for years and you simply have to have them dialed in properly.

Neither my original Q150e or the Q108MK2 have managed to "shake themselves apart" and are unlikely to do so since I check and tighten the screws once in a while...highly recommended. It’s more likely some cap will get funky or something, but these things are built to last...at least so far anyway. I can't imagine any newer sub being "faster" as that term is meaningless to me and seems more of a lazy audio catchphrase, especially with a sub.

There's a Q150e like the one I own (and the other one I just bought) on Ebay currently...I can enthusiastically recommend it. (no connection to seller, I simply noticed it)

Again, my REL subs have been in fairly constant use and haven't rattled apart at all...I've taken them apart and would notice anything rattling. 

A Goodwin's High End sales guy recently told me he thought the series RELs I own were excellent...but then, what does he know? I haven't compared them to new ones of course, but if they explode I just might.