Ease/speed of changing the lens isn't really a big deal, to be honest. And this is coming from someone who owns an ANON M2,which takes about 5 seconds, can be done with mittens on, and does give a full seal.
The reasoning is how often do you really change your lens? Once, maybe twice a day? MAYBE? And do you REALLY need to change it on the lift or in mid-run? Maybe. And does it REALLY make that much of a difference if it's 5 seconds or 25 seconds? Not really.
I think there's more emphasis on the lens swapping systems because that's something the marketing folks can sink their teeth into and push onto consumers. But the reality is very different. Far more important, IMHO, is fit and finish, durability, and field of vision. And by extension, obviously the lens, though it could be argued that 20% VLT lens is a 20% VLT lens, is a 20% VLT lens.
I've tried goggles and lenses from Smith, Spy, Oakley, Anon, Electric, Dragon, Bolle, Giro, and Scott. All have their pros and cons, but what's the most important to you? Fast changing lenses you'll use once or twice a day, or better field of vision and anti-fog coating? I prefer the latter features. Some of those goggles have a huge field of vision but they look like bug eyes or fighter pilot helmets. Does that matter to you? If not, get what makes you happy. If it does matter, then the Giro Onset is the most slimline goggle I've ever come across that provides a massive field of vision. But the Onset doesn't swap lenses as easily as my Anon M2. But the Oakley Flight Deck looks really stylish and steezy, man !!1!!!!one!!!1! [/TGR and NS sarcasm] Well, is style or substance more important?
But the swap systems aren't the end-all-and-be-all to goggles. Just a small part. Gimmicky? Maybe. Cool? Sure. Do they trump good optics, durability, fit, and value for you money? Arguably not.
There is no right answer. Only what is right FOR YOU. Find a goggle that FITS YOU really well and you can't go wrong. Love the one you love.
@Tog: I can't speak to the M2 with regards to tranceivers, but have NEVER had a problem with the lens twisting and popping off by putting the goggles up on the helmet. You need to REALLY twist the goggles to make the lens pop out of place. I had to work at it. The Anon M1/M2 system just doesn't really work like that. It's hard to describe, but you need to pinch the upper middle area and they pop right off. BUT........you have to be right on the money. Accidental misses and goggle ejection is actually tough to do. I've tried it. I suppose it's theoretically possible, but I've actively tried and never had an issue, not even once.