Can't speak for the 7wt Echo...I have an 8wt Echo Ion...and it is a VERY fast action (stiff) rod.
I love the TFO BVK series of rods, and caught a lot of nice bass on my 6wt this year. I bought the 7wt....but got it too late in the season to really try it out. Its all lined up, but I haven't cast it yet.
Sorry...that doesn't help much...but if that 7wt BVK is anything like the 5wt and 6wt...it'll be a GREAT rod!