I am making a similar move and have found a number of factors to consider:
Current unit is out of warranty
The LCX units do not have broadband sonar the HDS does
The HDS and HDS Gen 2 can be upgradeable to Structure Scan
The HDS and HDS Gen 2 Downscan is an outstanding feature to aid in deciphering 2 dimensional sonar readings
The HDS Gen 2 has Structure Map capability
My answer is yes it is “worth it”. If you only want one unit you can sell the LCX 27 to offset some of the cost.
I am finding there is a small learning curve in moving to HDS and Structure Scan from a LCX unit. But in the end it will be well “worth it”.