We use eleeks to develop our ERP system (our main focus) which has been very stable over these past years since we started using it in 2004! The support team always answers your questions quickly or by emailing back with solutions right away! I would not say there are any downsides but sometimes you may feel that maybe some features could be more user friendly such as creating new modules quicker etc.. But this will only take few minutes anyway so no big deal at all :) It's definitely worth checking out if looking into developing an enterprise solution like ours they have one great option available when working together withe them :). Our business requirement was mainly around data entry from different channels within customer relationship management module where client can enter his/her information regarding orders / accounts receivable ect.,.