It's pretty pricey, I think, for folks out of the gate, and they've been focused a lot more on developing the software more in line for Data Center operations, but I still love it.

Remember, ALP is free and best for small hosts. WHMCS is paid and not too cheap. So quality will vary with price, it's so simple

Acc Lab Plus can be much more better if codes are improved since not it is open source

It is now open source:

http://sourceforge.net/projects/accountlabplus/

Was released as open source at the beginning of the year.