This is an aptly timed thread as I am in the market for a new weed whaker too.
For the last 5 years I've run an Echo. It comes from their Combi line and also runs my stick edger. It has been a great machine for all that time and never given a lick of trouble ... until Tuesday. I went to use it and the primer buld split. Not too much of a problem and it was 5 years old. Picked up a new one, put it in and off we go again, for 5 minutes, and then it quit. It wasn't getting fuel and I found one of the fuel lines had broken off the little nipple on the plastic baseplate of the carburator. I decided that after breaking it twice in one day that I was going to take it in and have it repaired and serviced. Since I have no back-up I'm sitting here dead in the water, can't do the trimming and edging that needs to be done.
The guy at the small engine repair shop says he may have it ready tomorrow (which is good) or it may be next week (which is not). So, I'm sitting here thinking, "Do I need to get an el cheapo trimmer for about a $100 and just keep it as a spare once I get the Echo back or do I go get a "good" one such as a Steihl professional model for about $370". Years ago I swore off buying any more junk so I'm leaning towards the Steihl.
OR, I just had a thought, I could drive 50 miles and get a new Echo head unit that would power both the trimmer and the edger. That way, if either one of them fails again, it's just a matter of switching power units and carrying on. OK, problem solved. That's what I'm going to do. ECHO it is.