I hit with a friend of mines 2015 & CV 18x20's back to back and feel like this post describes it pretty accurately. The 2015 seemed to clang/vibrate when hit, whereas the CV just felt solid and had that thud at contact that I prefer. Never really understood 'brassy' or 'muted' until now. Still waiting to understand what 'buttery smooth' feels like.
I've hit with both old and new. Both are great frames. The cv model 98 is much better. Muted feel plush with no vibrations. Feels beefy and stable all around. Has more power and very easy to create spin. Strung weight is around 11.4 - 11.6oz depending on strings and grip. To me this frame wins frame of the year.
I agree with these previous comments.
I've used the blx blade 98 18X20 for a long while and an nblade for a shorter time.
I have not hit with the previous 16X19 blades & can't compare to those but can compare it to these 18X20 if that may help.
I hit with the new 16X19 CV for 45 min with a ball machine during a demo. Liked it enough to buy a brand new one & gave it a go for a couple hrs the other night. Strung it with 16 gauge RPM blast.
16X19 CV feels more forgiving than the blx & nblade. Sweet spot feels bigger, easier access to spin without hitting too loopy or high arc on shots - still can hit flat with pace. Power is better than the previous models but don't expect not easy pure drive-type power. I feel that as I get more dialed in to what works best with this frame that I'll be able to get good pop without overexerting myself - there's power to be had with the right swing & string setup. This racket feels very solid with good plow & very stable. The control is very good - it may just be a little less than the 18X20 pattern but the ease of access to spin & power is worth the minuscule control loss.
2HBH feels just as good with great feel & control - down the line shot is still a weapon that hurts ppl, but now I can hit sharp short, angled crosscourt dippers or roll deep into the corner with ease.
Volleys felt great - crisp feel with control - solid feel. Backhand slices were easy - the 18X20 may be just a tad more stable on chip slices but that's being extremely nitpicky.
Forehand has easier access to spin - I'm able to hit sharp, short angled rollers that pull the opponent off the court much easier & can roll angled shots deep in the corner. With the other pattern, I had to consciously try to exaggerate my topspin swing on both sides to get what seemed like average spin on my shots & could not hit these sharp rollers consistently. I've now got the sharp crosscourts & down the lines locked in.
Although I did not go for a lot of drop shots/volleys - I feel comfortable with the feel of this racket. Surprisingly it does not feel too stiff or lack touch like I felt the blx blade did.
My only gripes were that as mentioned in the TW review, it did not seem like I could go full swing & feel the racket crushing the serve like the blx. I had good pop & easier access to spin but it did not feel like it pummeled the ball big like a pure drive although I thought the blx did. Also, I had trouble dialing in how to hit a crushing forehand. I can hit it well but I could not summon the flat down-the-line bomb that the blx delivers. I felt there may be a soft spot in the upper sweet spot where I like to hit my serves & forehands & this may be the reason for the drop in power that I feel on these shots. I may need to adjust my point of contact, swing, or add lead to fix this & will try to sort it out.
These issues are minor as I feel that I can still play very well with this stick still even if I don't figure out how to drop heavy bombs on serves & forehands. I can still hits these shots well - just not as big compared to the blx blade.
This is one of the few rackets that I can leave off the vibration dampener & have no issues - the strings do not ping loudly like the other rackets. Putting a vibrasorb seemed to help me hit the forehand better although this is more likely a mental thing - it just felt/sounded like a more solid "thwack" with dampener & made me feel like I was making better contact.
This is a great solid well-rounded racket for me at the moment. I like this better than the previous 18X20 versions I've used due to more power, much easier access to spin without being too loopy, great stability, & still good control on shots.
Is it the 16x19 or the countervail that lets you "play longer"? 
