I'm using one wired in as line two on my home phone system. I put my biz
phone in it since no one will ever call me on my landline from work anymore
and this way the phones all over the house will ring. There is a slight
pause when you pick up, but the sound quality is close to using the CDMA
headset. I have a Moto T720 on Alltel.

I may eventually lose my landline as well.  There are now even more options
for doing this:
http://www.phonelabs.com/
http://www.uniden.com/ELBT/index.html

<I would get a Cell Socket to be able to use my cordless phone system
with the cell line. Does anyone have any experience/feedback?>
Check eBay - I got it $30 cheaper than going to their website.  I got one
for my son too.  We both have Motorola V600s.   Not too happy when I call
him - I don't know if it is the phones he is using with it or his reception
or what - I hear a bad echo - and lots of times it is just not a clear
voice.  Perhaps someone knows if it works better with different phones - he
has 2 cordless and 1 regular landline phone setup.  I bought one for me and
the few calls I tried it out with on an old landline phone (not cordless) -
seemed to work fine.  I have setup ringtones for different callers etc and I
just grab my cell it if I leave the house.  With cellsocket you would have
to unhook it which is no big deal but you do lose the individual ringtones.
I can understand the benefit of using cellsocket with several phones but if
you are just going to use it with only your cordless phone I'm not sure what
the benefit is.  DonnaB