2-L to 3-L: Absolutely yes. 3-L to 4-L: Hmmm.... Include 7/10MHz upgrade with 3-L: Yes, if you like 40/30 metres, but some would say it is not as aesthetically pleasing...but I wouldn't say that. Specifications can be deceiving. User comments, though anecdotal, seem to indicate the 3-L is the sweet spot between performance, cost, ease of installation and looks (if that's important).
7J1AQH / VE7HA
(Waiting for 3-L SteppIR installation next week)